Document:

STOCK
REPURCHASE AGREEMENT

 

THIS
STOCK REPURCHASE AGREEMENT (this “Agreement”) is made and entered into as of May 29, 2018 by and between Stephen B.
Keen and Brandy M. Keen (together the “Selling Stockholders”) and Surna Inc., a Nevada corporation (the “Company”).
The Selling Stockholders and the Company may be referred to herein individually as a “Party” or collectively as the
“Parties.”

 

WHEREAS,
the Selling Stockholders own in the aggregate 20,284,669 shares (the “Shares”) of common stock of the Company, $0.00001
par value (the “Common Stock”); and

 

WHEREAS,
the Shares are evidenced by certificate number 342-6 issued September 12, 2004 for 16,704,835 shares, by certificate number 892-0
issued May 10, 2017 for 664,834 shares, and 2,935,000 shares held in street name for the benefit of the Selling Stockholders (certificate
numbers 342-6 and 892-0 being referred to herein as the “Certificates”); and

 

WHEREAS,
the Selling Stockholders are willing to sell to the Company the Repurchased Shares (as defined below), contingent on the closing
of a private placement offering to accredited investors of the Common Stock (which may, in the sole discretion of the Company’s
Board of Directors (the “Board”), be a unit offering consisting of one share of Common Stock and a warrant to purchase
one share of Common Stock) resulting in minimum gross proceeds to the Company of $1,500,000 in one or more related sales or, in
the sole discretion of the Board, the Company may set aside 33.3% of the proceeds from each closing of the offering (not to exceed
$400,000 in the aggregate) to repurchase the shares of Common Stock hereunder (“Qualified Financing”); and 

 

WHEREAS,
the Selling Stockholders acknowledge that there is no assurance that the closing of the Qualified Financing will be consummated;
and

 

WHEREAS,
this Agreement and the transactions contemplated hereunder are subject to the approval of the Company’s Board of Directors
(the “Board”); and

 

WHEREAS,
the sale of the Repurchased Shares by the Selling Stockholders is intended to be a transaction exempt from Section 16(b) of the
Securities and Exchange Act of 1934, as amended (the “Exchange Act”) due to the Board’s approval of this Agreement
and the transactions contemplated hereunder; and

 

WHEREAS,
on the terms and subject to the conditions set forth in this Agreement, including the willingness of the Selling Stockholders
to wait until the Company has consummated the closing of a Qualified Financing, the Selling Stockholders desire to sell to the
Company and the Company desires to purchase from the Selling Stockholders, the Repurchased Shares.

 

NOW,
THEREFORE, IN CONSIDERATION of the recitals set forth above and the mutual covenants contained in this Agreement, and for other
good and valuable consideration the receipt and adequacy of which are hereby acknowledged, the Company and the Selling Stockholders
agree as follows:

 

    	 

     

    

 

1.       Repurchase
and Sale of Common Stock.

 

(a)       Upon
the terms and subject to the conditions of this Agreement, (i) the Company agrees to repurchase such portion of the Shares, which
amount of Shares will be based on the Repurchase Price per Share (as defined below) and would result in an aggregate maximum repurchase
price of $400,000 (“Repurchased Shares”), and (ii) the Selling Stockholders agree to sell the Repurchased Shares.
The repurchase price per each Repurchased Share to be paid by the Company under this Agreement shall be: (i) if the Qualified
Financing is a unit offering, a price equal to 80% of the unit price paid by investors to reflect the estimated value of the warrant,
or (ii) if the Qualified Offering includes only the sale of shares of Common Stock, a price equal to 100% of the share price paid
by investors (the “Repurchase Price per Share”). The aggregate repurchase price for the Repurchased Shares (the “Repurchase
Price”) shall be payable in cash by wire transfer or delivery of other immediately available funds at the Closing (as defined
below).

 

(b)       The
repurchase and sale of the Repurchased Shares (the “Closing”) shall take place at the offices of the Company, or such
other location mutually agreeable to the parties hereto, at 10:00 a.m. MT on the date when all the conditions to the Closing have
been satisfied or (subject to applicable law) waiver of the conditions set forth in Section 4 and Section 5 (excluding conditions
that, by their terms, cannot be satisfied until the Closing).

 

(c)       At
the Closing:

 

(i)       the
Selling Stockholders shall deliver the Certificates representing the Repurchased Shares to the Company, together with duly executed
instruments of transfer or assignment (such as a stock power) in blank with signatures medallion guaranteed; and

 

(ii)       the
Company shall deliver or cause to be delivered the Repurchase Price by wire transfer in immediately available funds to the account
as specified in writing by the Selling Stockholder.

 

2.       Representations
and Warranties of the Selling Stockholders. The Selling Stockholders jointly and severally represent and warrant to the Company
as of the date hereof and as of the Closing as follows:

 

(a)       Authorization;
Enforcement. The Selling Stockholders, individually and together, have the full right, power and authority to enter into this
Agreement and to sell, transfer and deliver the Repurchased Shares to be sold by the Selling Stockholders hereunder. This Agreement
when executed and delivered by the Selling Stockholders, will constitute a valid and legally binding obligation of the Selling
Stockholders, enforceable against the Selling Stockholders in accordance with its terms, except (A) as limited by applicable bankruptcy,
insolvency, reorganization, moratorium, fraudulent conveyance, and other laws of general application affecting enforcement of
creditors’ rights generally; and (B) as limited by laws relating to the availability of specific performance, injunctive
relief or other equitable remedies. The execution and delivery of this Agreement and the sale and delivery of the Repurchased
Shares to be sold by the Selling Stockholders and the consummation of the transactions contemplated herein do not and will not,
whether with or without the giving of notice or passage of time or both, conflict with or constitute a breach of, default under,
or result in the creation or imposition of any tax, lien, charge or encumbrance upon the Repurchased Shares or any property or
assets of the Selling Stockholders pursuant to any contract, indenture, mortgage, deed of trust, loan or credit agreement, note,
license, lease or other agreement or instrument to which the Selling Stockholders are a party or by which the Selling Stockholders
may be bound, or to which any of the property or assets of the Selling Stockholders is subject, nor will such action result in
any violation of any applicable law, statute, rule, regulation, judgment, order, writ or decree of any government, government
instrumentality or court, domestic or foreign, having jurisdiction over the Selling Stockholders or any of their properties.

 

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(b)       Filing,
Consents and Approvals. The Selling Stockholders are not required to obtain any consent, waiver, authorization or order of,
give any notice to, or make any filing or registration with, any court or other federal, state, local or other governmental authority
or other person or entity in connection with the execution, delivery and performance by them of this Agreement, including the
sale and repurchase of the Repurchased Shares, other than (A) filings with the Securities and Exchange Commission, and (B) those
made or obtained prior to the date hereof.

 

(c)       Valid
Title. The Selling Stockholders have and will at the Closing have valid title to the Repurchased Shares to be sold by the
Selling Stockholders hereunder, free and clear of any security interest, mortgage, pledge, lien, charge, claim, equity or encumbrance
of any kind.

 

(d)       Absence
of Manipulation. The Selling Stockholders have not taken, and will not take, prior to the Closing, directly or indirectly,
any action which is designed to or which has constituted or which might reasonably be expected to cause or result in stabilization,
shorting, hedging or manipulation of the Common Stock or the price of any security of the Company.

 

(e)       Certificates
Suitable for Transfer. The Certificates for all of the Repurchased Shares to be sold by the Selling Stockholders pursuant
to this Agreement are in suitable form for transfer by delivery and will be accompanied by duly executed instruments of transfer
or assignment in blank with signatures medallion guaranteed.

 

(f)       Access
to Data. The Selling Stockholders have not been furnished with nor relied upon any representations or other information (whether
oral or written) relating to the business or financial condition of the Company or its representatives or agents other as described
set forth in the Company’s publicly available documents. To the extent that they are aware of any other information, public
or private about the Company and its financial condition and prospects, they have also taken that information into consideration
in their decision to enter this Agreement. The Selling Stockholders realize that by selling the Repurchased Shares, they may be
foregoing the opportunity to benefit from any increase in the value of the Repurchased Shares.

 

(g)       Adequate
Representation. The Selling Shareholders have either had this Agreement reviewed by their professional advisors, including
without limitation their accountant, tax and legal advisers, or decided to forego obtaining their advice. The Selling Shareholders
are not relying on any accounting, tax, or legal advice which may be or may have been suggested by any Company official or consultant
or adviser.

 

(h)       Qualified
Financing Contingency. The Selling Shareholders acknowledge and agree that the sale and repurchase by the Company of the Repurchased
Shares under this Agreement is subject to the Company’s closing of a Qualified Financing, and without such financing, the
Company will not have any obligation to repurchase the Repurchased Shares. The Selling Shareholders understand that the Company
is giving no assurance that it will be able to complete a Qualified Financing, that it has no commitments from any investors to
invest in a Qualified Financing, has not hired and may not hire any selling agent to facilitate the sale of securities in a Qualified
Financing, and that the officers, directors and current investors in the Company have made no commitment to invest in the Company
to raise any portion of the Qualified Financing. The Selling Shareholders understand and agree that the Company has full discretion
in the structuring of the sale of the securities and defining the terms of the offering of the securities, and the Company has
full discretion to not make any offering or to withdraw any offering at any time once commenced.

 

3.       Representations
and Warranties of the Company. The Company represents and warrants to the Selling Stockholders as of the date hereof and as
of the Closing as follows:

 

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(a)       Authorization;
Enforcement. The Company has the full right, power and authority to enter into and deliver this Agreement, and this Agreement
when executed and delivered by the Company, assuming this Agreement is a valid and legally binding obligation of the Selling Stockholder,
constitutes a valid and legally binding obligation of the Company, enforceable against the Company in accordance with its terms
except (A) as limited by applicable bankruptcy, insolvency, reorganization, moratorium, fraudulent conveyance, and other laws
of general application affecting enforcement of creditors; rights generally; and (B) as limited by laws relating to the availability
of specific performance, injunctive relief, or other equitable remedies. The Company has the full legal right and power and all
authority and approval required to execute and deliver, or authorize execution and delivery of, this Agreement, and all other
instruments executed and delivered by or on behalf of the Company in connection with the repurchase of the Repurchased Shares
by the Company from the Selling Stockholders hereunder.

 

(b)       Compliance
with Other Instruments. The execution, delivery and performance of this Agreement by the Company and the consummation of the
transactions contemplated hereby and thereby will not result in any violation or be in conflict with or constitute, with or without
the passage of time and giving of notice, either a default under any provision of the governing documents of the Company or any
instrument, judgment, order, writ, decree or contract to which the Company or any of its subsidiaries is a party or by which it
is bound, or any provision of any federal or state statute, rule or regulation applicable to the Company or any of its subsidiaries.

 

4.       Conditions
of the Company’s Obligations at Closing. The obligations of the Company to the Selling Stockholders under this Agreement
are subject to the fulfillment, on or before the Closing, of each of the following conditions, unless otherwise waived by the
Company:

 

(a)       Closing
of Qualified Financing. As a condition to the Company’s obligation to purchase the Repurchased Shares hereunder, the
Company shall complete a Qualified Financing, the offering to be in the full discretion of the Company, including the offering
terms, timing, right to not commence an offering and to terminate at any time any offering commenced.

 

(b)       Delivery
of Certificates. The Selling Stockholders shall have presented and delivered the Certificates representing the Repurchased
Shares and the accompanying instruments of transfer to the Company.

 

5.       Conditions
of the Selling Stockholders’ Obligations at Closing. The obligations of the Selling Stockholders to the Company under
this Agreement are subject to the fulfillment, on or before the Closing, of each of the following any conditions, unless otherwise
waived by the Selling Stockholder:

 

(a)       Delivery
of the Purchase Price. The Company shall have sufficient funds to pay the Repurchase Price and be in a position to pay the
Repurchase Price as of the Closing in good funds.

 

6.       Covenants.

 

(a)       Publicity.
The Selling Shareholders will consult with the Company in issuing any press releases or otherwise making public statements with
respect to the transactions contemplated by this Agreement and any related materials, and the Selling Shareholders will not issue
any press release or otherwise make any public statement, other than as required by law, without the prior written consent of
the Company, except that no prior consent shall be required if such disclosure is required by law, in which such case the disclosing
Selling Shareholder will provide the Company with prior notice of the proposed public statement. The Selling Shareholders acknowledge
that this Agreement and related materials may be deemed to be a “material contract,” as that term is defined by Item
601(b)(10) of Regulation S-K and the Company may therefore be required to file this Agreement as an exhibit to reports or registration
statements filed with the Securities and Exchange Commission. The Selling Stockholders further agree that the status of this Agreement
and any related materials as material contracts shall be determined solely by the Company, in consultation with its counsel.

 

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(b)       Trading
Activities. Until the consummation of the repurchase of the Repurchased Shares and the Closing, each of the Selling Shareholders
and their affiliates agrees not to maintain any open short position or engage in any other form of hedging or similar transactions
in the Common Stock of the Company, and the Selling Shareholders each agree that it shall not, and that it will cause its affiliates
not to, engage in any short sales of or hedging or similar transactions with respect to the Common Stock of the Company.

 

7.       Miscellaneous.

 

(a)       Survival
of Representations and Warranties. The representations and warranties of the Selling Stockholders and the Company contained
herein shall terminate on the second anniversary of the Closing and thereafter shall expire and have no further force and effect.
Notwithstanding the foregoing, the representation of the Selling Stockholders in Section 2(c) hereof, which relates to valid title,
shall survive until the sixth year anniversary of the Closing.

 

(b)       Transfer,
No Third-Party Beneficiaries. This Agreement shall not be assigned without the prior written consent of the Company; provided,
that the Company may transfer its rights hereunder to a third party, so long as such third party agrees in writing to be bound
by all obligations under this Agreement and confirms in writing the representations and warranties set forth in Section 3 as if
made by such third party. Nothing in this Agreement, express or implied, is intended to confer upon any party other than the parties
hereto or their respective successors and assigns any rights, remedies, obligations, or liabilities under or by reason of this
Agreement.

 

(c)       Counterparts.
This Agreement may be executed in two or more counterparts, including by facsimile, PDF, DocuSign, or other generally recognized
form of electronic transmission each of which shall be deemed an original and all of which together shall constitute one and the
same instrument and shall become effective when counterparts have been signed by each of the parties and delivered to the other
party; it being understood that all parties need not sign the same counterpart.

 

(d)       Titles
and Subtitles. The titles and subtitles used in this Agreement are used for convenience only and are not to be considered
in construing or interpreting this Agreement.

 

(e)       Notices.
Any notice required or permitted by this Agreement shall be in writing and shall be deemed sufficient upon delivery, when delivered
personally or by overnight courier or sent by fax or email, both with evidence of a completed transmission and receipt, or four
(4) business days after being deposited in the U.S. mail, as certified or registered mail, with postage prepaid, addressed to
the party to be notified at such party’s address as set forth on the signature page hereto, or as subsequently modified
by written notice, and if to the Selling Stockholders at 6914 Peace Street, Frederick, CO 80530, and if to the Company, 1780 55th
Street, Boulder, Colorado 80301, Attn.: President & CEO.

 

(f)       Finder’s
Fee. Each party represent that it neither is nor will be obligated for any finder’s fee or commission in connection
with this transaction.

 

(g)       Fees
and Expenses. Each of the Selling Stockholders and the Company shall pay their respective fees and all other associated expenses
incurred by such party in connection with the negotiation, execution, delivery and performance of the Agreement. The Company shall
pay all transfer agent fees and stamp taxes. Any other costs of the transfer of the Repurchased Shares to the Company and any
taxes, costs, imposts or duties levied or due at any time in connection with the sale of the Repurchased Shares to the Company
shall be the sole, joint and several responsibility of the Selling Shareholders.

 

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(h)       Amendments,
Modifications and Waivers. No amendment, modification or waiver in respect of this Agreement shall be effective against any
party unless it shall be in writing and signed by the Selling Stockholders and the Company.

 

(i)       Entire
Agreement. This Agreement constitutes the entire agreement among the parties hereto with respect to the subject matter hereof
and supersedes all other prior agreements and understandings, both written and oral, among or between any of the parties with
respect to the subject matter hereof and thereof.

 

(j)       Consent
to Jurisdiction; Venue. Regardless of any conflict of law or choice of law principles that might otherwise apply, the parties
agree that this Agreement shall be governed by and construed in all respects in accordance with the laws of the State of Colorado.
The parties all expressly agree and acknowledge that the State of Colorado has a reasonable relationship to the parties and/or
this Agreement. As to any dispute, claim or litigation arising out of or relating in any way to this Agreement or the transaction
contemplated hereby, the parties hereto hereby agree and consent to be subject to the exclusive jurisdiction of any state court,
or federal court of the United States of America, sitting in Denver, Colorado, and any appellate court from any thereof. Each
party hereto hereby irrevocably waives, to the fullest extent permitted by law, (a) any objection that it may now or hereafter
have to laying venue of any suit, action or proceeding brought in such court, (b) any claim that any suit, action or proceeding
brought in such court has been brought in an inconvenient forum, and (c) any defense that it may now or hereafter have based on
lack of personal jurisdiction in such forum.

 

(k)       WAIVER
OF JURY TRIAL. EACH OF THE PARTIES IRREVOCABLY WAIVES ANY AND ALL RIGHTS TO TRIAL BY JURY IN ANY ACTION OR PROCEEDING BETWEEN
THE PARTIES ARISING OUT OF OR RELATING TO THIS AGREEMENT AND THE TRANSACTIONS CONTEMPLATED BY THIS AGREEMENT.

 

(l)       Successors.
This Agreement and all of the provisions hereof shall be binding upon and inure to the benefit of the parties hereto and their
respective successors and permitted assigns

 

(m)       Cooperation.
Each of the Selling Stockholders and the Company agrees to reasonably cooperate with the other parties and, at their own cost,
time being of the essence, to execute and deliver such further documents, certificates, agreements and instruments and to take
such other actions as may be reasonably requested by such party to evidence or reflect the transactions contemplated by this Agreement
and to carry out the intent and purpose of this Agreement.

 

(n)       Severability.
If any term or other provision of this Agreement is held invalid or unenforceable by any court of competent jurisdiction, the
other provisions of this Agreement will remain in full force and effect so long as the economic or legal substance of this Agreement
is not affected in any manner materially adverse to any party. Upon such determination that any term or other provision is invalid,
illegal or incapable of being enforced, the parties hereto shall negotiate in good faith to modify this Agreement so as to effect
the original intent of the parties as closely as possible in a mutually acceptable manner in order that the terms of this Agreement
remain as originally contemplated to the fullest extent possible.

 

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(o)       
Specific Performance; Injunctive Relief. The parties hereto acknowledge that the parties shall be irreparably harmed and
that there shall be no adequate remedy at law for a violation of any of the covenants or agreements of the other parties set forth
in this Agreement. Therefore, each party hereby agrees that, in addition to any other remedies that may be available to the Selling
Stockholders or the Company, as applicable upon any such violation, such party shall have the right to enforce such covenants
and agreements by specific performance, injunctive relief or by any other means to which they are entitled at law or in equity.

 

(p)       Representation.
This Agreement was negotiated by the parties with the benefit of legal representation, or such representation was affirmatively
considered and not sought, and any rule of construction or interpretation otherwise requiring this Agreement to be construed or
interpreted against any party shall not apply to any construction or interpretation thereof.

 

(Signature
Page Follow)

 

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IN
WITNESS WHEREOF, the parties have executed this Stock Repurchase Agreement as of the date first written above.

 

	COMPANY:	 
	 	 
	Surna
    Inc.	 
	A
    Nevada corporation	 
	 	 	 
	By:	/s/ Chris
    Bechtel	 
	Name:	Chris
    Bechtel	 
	Title:	Chief
    Executive Officer	 
	 	 	 
	SELLING
    STOCKHOLDERS:	 
	 	 	 
	By:	/s/ Stephen
    B. Keen	 
	Name:	Stephen
    B. Keen	 
	 	 	 
	By:	/s/ Brandy
    M. Keen	 
	Name:	Brandy
    M. Keen	 

 

    	8PREFERRED
STOCK OPTION AGREEMENT

 

THIS
PREFERRED STOCK OPTION AGREEMENT (this “Agreement”) is made and entered into as of May 29, 2018 by and between Stephen
B. Keen and Brandy M. Keen (together the “Selling Stockholders”) and Surna Inc., a Nevada corporation (the “Company”).
The Selling Stockholders and the Company may be referred to herein individually as a “Party” or collectively as the
“Parties.”

 

WHEREAS,
the Selling Stockholders own in the aggregate of 35,189,669 shares (the “Shares”) of preferred stock of the Company,
$0.00001 par value (the “Preferred Stock”), as evidenced by certain stock certificates (the “Certificates”);

 

WHEREAS,
the Selling Stockholders are willing to sell to the Company the Shares, pursuant to this option Agreement on the basis of an exchange
of common stock of the Company, $0.00001 par value (“Common Stock”) for the outstanding Shares; and

 

WHEREAS,
this Agreement and the transactions contemplated hereunder are subject to the approval of the Company’s Board of Directors
(the “Board”); and

 

WHEREAS,
this Agreement and the issuance of the Common Stock to the Selling Stockholders upon exercise of this option by the Company and
the exchange of the Shares are intended to be transactions exempt from Section 16(b) of the Securities and Exchange Act of 1934,
as amended (the “Exchange Act”) due to the Board’s approval of this Agreement and the transactions contemplated
hereunder; and

 

WHEREAS,
on the terms and subject to the conditions set forth in this Agreement, the Selling Stockholders desire to grant to the Company
this option and upon exercise of the option to sell to the Company by way of an exchange of Common Stock for the Shares, and the
Company desires to obtain this option and have the right to acquire the Shares from the Selling Stockholders.

 

NOW,
THEREFORE, IN CONSIDERATION of the recitals set forth above and the mutual covenants contained in this Agreement, and for other
good and valuable consideration in the amount of $5,000, the receipt and adequacy of which are hereby acknowledged, the Company
and the Selling Stockholders agree as follows:

 

1.       Grant
of Option. The Selling Shareholders jointly and severally hereby grant to the Company the option to acquire any or all of
the Shares at any time and from time to time, during the exercise period of this option Agreement.

 

2.       Exercise
Period. The option granted to the Company to acquire the Shares may be exercised at any time and from time to time, for any
or all of the Shares, from the date hereof through the close of business at 5:00 pm, Colorado Time, on April 30, 2020. After the
foregoing date, this option may not be exercised, absent a written amendment or modification of this Agreement agreed by the Selling
Shareholders and the Company.

 

3.       Exercise
Price of the Option. The Company has the right to acquire the Shares in round lots of 1,000 Shares for an exercise price per
round lot of one (1) share of Common Stock. The option must be exercised for round lots of 1,000 of the Shares, and after exercise
of all the round lots of the Shares available to be acquired, if there remains an amount of Shares held by the Selling Shareholders
that is less than 1,000, then the Company may acquire the remaining number of Shares for one (1) share of Common Stock. The Company
shall only issue a full share of Common Stock, and if a fractional share of Common Stock is due to be issued, the Company will
round up to the next whole share of Common Stock.

 

    	 

     

    

 

4.       Exercise
of the Option.

 

(a)
The option may be exercised by delivering to the Selling Shareholders a notice of exercise in the form attached hereto as Exhibit
A, duly completed and executed by the Company. Within five (5) business days of the date of the exercise notice, the Selling
Shareholders, time being of the essence, will deliver the number of Shares being acquired under the exercise notice, against the
issuance by the Company of the number of shares of Common Stock due and owing for the acquired Shares. The issuance of the Common
Stock may be by delivery of the Common Stock by certificate, DRS notice from the transfer agent for the Company or other forms
of electronic delivery of the Common Stock, at the discretion of the Company. The Selling Stockholders understand that the shares
of Common Stock issued upon the exercise of the option shall be “restricted securities” under applicable U.S. federal
and state securities laws and that, pursuant to these laws, the Selling Stockholders must hold the shares of Common Stock indefinitely
unless they are registered with the Securities and Exchange Commission (“SEC”) and qualified by state authorities,
or an exemption from such registration and qualification requirements is available. The Selling Stockholders acknowledge that
the Company has no obligation to register or qualify the shares of Common Stock for resale. The Company and Selling Stockholders,
subject to the advice of counsel and taking into consideration all relevant facts, will seek to apply the tacking provisions of
Rule 144 promulgated by the SEC so that the holding period of the Common Stock issued on exercise of the option will include the
holding period of the Shares.

 

(b)       Upon
exercise of the option and delivery of the Common Stock in exchange for the Shares, the Selling Shareholders will be responsible
for all federal, state and local income or other taxes. If the transaction requires the withholding of any tax payment, then prior
to the delivery of the Common Stock, the Selling Shareholders will pay to the Company the amount due to be paid in respect of
any tax payment, or arrange for the Company to withhold from any other payment due to the Selling Shareholders, severally or jointly,
the amount due for the sale of the Shares to the Company or the receipt of the Common Stock on exercise of the option under this
Agreement, so as to sufficiently satisfy any applicable tax obligation incident to the exercise of this option.

 

5.       No
Transfer or Assignment. The Selling Shareholders agree not to transfer, encumber, pledge or hypothecate or otherwise grant
any option or other right to any person or entity in the Shares during the exercise period of the option and any agreed upon extension.
Additionally, the Selling Shareholders shall not assign this Agreement to any other person or entity, without the express written
consent of the Company, which may be conditioned on any requirement of the Company as determined in its discretion, which consent
may be withheld in the Company’s discretion for any reason. The Company is hereby granted the authority to not transfer
or otherwise to stop the transfer of the Shares during the term of this Agreement to any person or entity other than the Company
if the Selling Shareholders attempt to affect a transfer, encumbrance, pledge or hypothecation of the Shares to any person or
entity other than the Company. Any attempt to affect a transfer, encumbrance, pledge or hypothecation of the Shares by the Selling
Shareholders in violation of this Agreement shall be null and void ab initio, shall not be recorded on the books of the
Company or its transfer agent and shall not be recognized by the Company. Each party hereto acknowledges and agrees that any breach
of this provision of the Agreement would result in substantial harm to the other parties hereto for which monetary damages alone
could not adequately compensate. Therefore, the parties hereto unconditionally and irrevocably agree that the Company shall be
entitled to seek protective orders, injunctive relief and other remedies available at law or in equity (including, without limitation,
seeking specific performance or the rescission of purchases, sales and other transfers of Shares not made in strict compliance
with this Agreement), in addition to any other rights that the Company may exercise at law or under this Agreement.

 

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6.       Compliance
with Laws and Regulations.

 

(a)
       The Company will not be obligated to issue or deliver shares of Common Stock pursuant
to this Agreement unless the issuance and delivery of the shares of Common Stock in exchange for the Shares complies with applicable
law, including, without limitation, the Securities Act of 1933, as amended, the Securities Act of 1934, as amended, and the requirements
of any stock exchange or market upon which the Common Stock may then be listed, and shall be further subject to the approval of
counsel for the Company with respect to such compliance.

 

(b)       In
connection with the exercise of this option, Selling Shareholders will execute and deliver to the Company such representations
in writing as may be requested by the Company so that it may comply with the applicable requirements of the United States federal
and state securities laws.

 

(c)       If
in compliance with the United States federal and state securities laws a restrictive legend is required to be placed against the
Common Stock issued in exchange for the Shares, then the Selling Shareholders hereby consent to the imposition of any restrictions
necessary for the Company to comply with the applicable securities laws, including the placement of an appropriate restrictive
legend and stop transfer orders against the shares of Common Stock to be delivered to them.

 

7.       Notices.
Any notice required or permitted by this Agreement shall be in writing and shall be deemed sufficient upon delivery, when delivered
personally or by overnight courier or sent by fax or email, both with evidence of a completed transmission and receipt, or four
(4) business days after being deposited in the U.S. mail, as certified or registered mail, with postage prepaid, addressed to
the Company at its principal executive offices, Attention: Chief Executive Officer, or to Selling Shareholders at the residence/office
address reflected in the records maintained by the Company on a current basis.

 

8.       Adjustment
to the Number of Shares. If the Company implements any reverse stock split of its Common Stock or the Preferred Stock or issues
any shares of Common Stock or Preferred Stock to all the holders of the class of stock by means of a dividend or forward split,
then the number of shares of Common Stock to be issued or the number of Shares to be acquired shall be appropriately and equitably
adjusted to reflect the change in the capitalization of the Company. If any shares of Common Stock or other securities are issued
by way of dividend or forward split in respect of the Preferred Stock, then this option Agreement shall equally apply to those
securities, so that the Company has the right to acquire the other securities.

 

9.       Representations
and Warranties of the Selling Stockholders. The Selling Stockholders jointly and severally represent and warrant to the Company
as of the date hereof and as of the Closing as follows:

 

(a)       Authorization;
Enforcement. The Selling Stockholders, individually and together, have the full right, power and authority to enter into this
Agreement and to sell, transfer and deliver the Shares to be sold by the Selling Stockholders hereunder. This Agreement when executed
and delivered by the Selling Stockholders, will constitute a valid and legally binding obligation of the Selling Stockholders,
enforceable against the Selling Stockholders in accordance with its terms, except (A) as limited by applicable bankruptcy, insolvency,
reorganization, moratorium, fraudulent conveyance, and other laws of general application affecting enforcement of creditors’
rights generally; and (B) as limited by laws relating to the availability of specific performance, injunctive relief or other
equitable remedies. The execution and delivery of this Agreement and the sale and delivery of the Shares to be sold by the Selling
Stockholders and the consummation of the transactions contemplated herein do not and will not, whether with or without the giving
of notice or passage of time or both, conflict with or constitute a breach of, default under, or result in the creation or imposition
of any tax, lien, charge or encumbrance upon the Shares or any property or assets of the Selling Stockholders pursuant to any
contract, indenture, mortgage, deed of trust, loan or credit agreement, note, license, lease or other agreement or instrument
to which the Selling Stockholders are a party or by which the Selling Stockholders may be bound, or to which any of the property
or assets of the Selling Stockholders is subject, nor will such action result in any violation of any applicable law, statute,
rule, regulation, judgment, order, writ or decree of any government, government instrumentality or court, domestic or foreign,
having jurisdiction over the Selling Stockholders or any of their properties.

 

    	3

     

    

 

(b)       Filing,
Consents and Approvals. The Selling Stockholders are not required to obtain any consent, waiver, authorization or order of,
give any notice to, or make any filing or registration with, any court or other federal, state, local or other governmental authority
or other person or entity in connection with the execution, delivery and performance by them of this Agreement, including the
sale and purchase of the Shares, other than (A) filings with the Securities and Exchange Commission, and (B) those made or obtained
prior to the date hereof.

 

(c)       Valid
Title. The Selling Stockholders have and will at the exercise of the option under this Agreement have valid title to the Shares
to be sold by the Selling Stockholders hereunder, free and clear of any security interest, mortgage, pledge, lien, charge, claim,
equity or encumbrance of any kind.

 

(d)       Absence
of Manipulation. The Selling Stockholders have not taken, and will not take, prior to the exercise of the option under this
Agreement, directly or indirectly, any action which is designed to or which has constituted or which might reasonably be expected
to cause or result in stabilization, shorting, hedging or manipulation of the Common Stock or the price of any security of the
Company.

 

(e)       Certificates
Suitable for Transfer. The Certificates for all of the Shares to be sold by the Selling Stockholders pursuant to this Agreement
are in suitable form for transfer by delivery and will be accompanied by duly executed instruments of transfer or assignment in
blank with signatures medallion guaranteed.

 

(d)       Access
to Data. The Selling Stockholders have not been furnished with nor relied upon any representations or other information (whether
oral or written) relating to the business or financial condition of the Company or its representatives or agents other as described
set forth in the Company’s publicly available documents. To the extent that they are aware of any other information, public
or private about the Company and its financial condition and prospects, they have also taken that information into consideration
in their decision to enter this Agreement. The Selling Stockholders realize that by selling the Shares, they may be foregoing
the opportunity to benefit from any increase in the value of the Shares.

 

(e)       Adequate
Representation. The Selling Shareholders have either had this Agreement reviewed by their professional advisors, including
without limitation their accountant, tax and legal advisers, or decided to forego obtaining their advice. The Selling Shareholders
are not relying on any accounting, tax, or legal advice which may be or may have been suggested by any Company official or consultant
or adviser.

 

10.       Representations
and Warranties of the Company. The Company represents and warrants to the Selling Stockholders as of the date hereof and as
of the Closing as follows:

 

(a)       Authorization;
Enforcement. The Company has the full right, power and authority to enter into and deliver this Agreement, and this Agreement
when executed and delivered by the Company, assuming this Agreement is a valid and legally binding obligation of the Selling Stockholders,
constitutes a valid and legally binding obligation of the Company, enforceable against the Company in accordance with its terms
except (A) as limited by applicable bankruptcy, insolvency, reorganization, moratorium, fraudulent conveyance, and other laws
of general application affecting enforcement of creditors; rights generally; and (B) as limited by laws relating to the availability
of specific performance, injunctive relief, or other equitable remedies. The Company has the full legal right and power and all
authority and approval required to execute and deliver, or authorize execution and delivery of, this Agreement, and all other
instruments executed and delivered by or on behalf of the Company in connection with the purchase of the Shares by the Company
from the Selling Stockholders hereunder.

 

    	4

     

    

 

(b)       Compliance
with Other Instruments. The execution, delivery and performance of this Agreement by the Company and the consummation of the
transactions contemplated hereby and thereby will not result in any violation or be in conflict with or constitute, with or without
the passage of time and giving of notice, either a default under any provision of the governing documents of the Company or any
instrument, judgment, order, writ, decree or contract to which the Company or any of its subsidiaries is a party or by which it
is bound, or any provision of any federal or state statute, rule or regulation applicable to the Company or any of its subsidiaries.

 

(c)
       Issuance of Shares of Common Stock. The shares of Common Stock to be issued in
exercise of the option under this Agreement have been duly authorized and, when issued and paid for in accordance with this Agreement
by receipt of the Shares, will be duly and validly issued, fully paid and non-assessable, free and clear of all liens and other
encumbrances (subject to the restrictions of the Federal and state securities laws), with the holders being entitled to all rights
accorded to a holder of Common Stock.

 

11.       Covenants.

 

(a)       Publicity.
The Selling Shareholders will consult with the Company in issuing any press releases or otherwise making public statements with
respect to the transactions contemplated by this Agreement and any related materials, and the Selling Shareholders will not issue
any press release or otherwise make any public statement, other than as required by law, without the prior written consent of
the Company, except that no prior consent shall be required if such disclosure is required by law, in which such case the disclosing
Selling Shareholder will provide the Company with prior notice of the proposed public statement. The Selling Shareholders acknowledge
that this Agreement and related materials may be deemed to be a “material contract,” as that term is defined by Item
601(b)(10) of Regulation S-K and the Company may therefore be required to file this Agreement as an exhibit to reports or registration
statements filed with the Securities and Exchange Commission. The Selling Stockholders further agree that the status of this Agreement
and any related materials as material contracts shall be determined solely by the Company, in consultation with its counsel.

 

(b)       Trading
Activities. Until the exercise of the option under this Agreement and consummation of the purchase of the Shares, each of
the Selling Shareholders and their affiliates agrees not to maintain any open short position or engage in any other form of hedging
or similar transactions in the Common Stock of the Company, and the Selling Shareholders each agree that it shall not, and that
it will cause its affiliates not to, engage in any short sales of or hedging or similar transactions with respect to the common
stock of the Company.

 

12.       Miscellaneous.

 

(a)       Survival
of Representations and Warranties. The representations and warranties of the Selling Stockholders and the Company contained
herein shall terminate on the second anniversary of the exercise of the option under this Agreement and thereafter shall expire
and have no further force and effect. Notwithstanding the foregoing, the representation of the Selling Stockholders in Section
9(c) hereof, which relates to valid title, shall survive for a period of six years after the exercise of the option under this
Agreement.

 

    	5

     

    

 

(b)       Counterparts.
This Agreement may be executed in two or more counterparts, including by facsimile, PDF, DocuSign, or other generally recognized
form of electronic transmission each of which shall be deemed an original and all of which together shall constitute one and the
same instrument and shall become effective when counterparts have been signed by each of the parties and delivered to the other
party; it being understood that all parties need not sign the same counterpart.

 

(c)       Titles
and Subtitles. The titles and subtitles used in this Agreement are used for convenience only and are not to be considered
in construing or interpreting this Agreement.

 

(d)       Finder’s
Fee. Each party represent that it neither is nor will be obligated for any finder’s fee or commission in connection
with this transaction.

 

(e)       Fees
and Expenses. Each of the Selling Stockholders and the Company shall pay their respective fees and all other associated expenses
incurred by such party in connection with the negotiation, execution, delivery and performance of the Agreement. The Company shall
pay all transfer agent fees and stamp taxes. Any other costs of the transfer of the Shares to the Company and any taxes, costs,
imposts or duties levied or due at any time in connection with the delivery of the Shares to the Company in exchange for Common
Stock shall be the sole, joint and several responsibility of the Selling Shareholders.

 

(f)       Amendments,
Modifications and Waivers. No amendment, modification or waiver in respect of this Agreement shall be effective against any
party unless it shall be in writing and signed by the Selling Stockholders and the Company.

 

(g)       Entire
Agreement. This Agreement constitutes the entire agreement among the parties hereto with respect to the subject matter hereof
and supersedes all other prior agreements and understandings, both written and oral, among or between any of the parties with
respect to the subject matter hereof and thereof.

 

(h)       Consent
to Jurisdiction; Venue. Regardless of any conflict of law or choice of law principles that might otherwise apply, the parties
agree that this Agreement shall be governed by and construed in all respects in accordance with the laws of the State of Colorado.
The parties all expressly agree and acknowledge that the State of Colorado has a reasonable relationship to the parties and/or
this Agreement. As to any dispute, claim or litigation arising out of or relating in any way to this Agreement or the transaction
contemplated hereby, the parties hereto hereby agree and consent to be subject to the exclusive jurisdiction of any state court,
or federal court of the United States of America, sitting in Denver, Colorado, and any appellate court from any thereof. Each
party hereto hereby irrevocably waives, to the fullest extent permitted by law, (a) any objection that it may now or hereafter
have to laying venue of any suit, action or proceeding brought in such court, (b) any claim that any suit, action or proceeding
brought in such court has been brought in an inconvenient forum, and (c) any defense that it may now or hereafter have based on
lack of personal jurisdiction in such forum.

 

(i)       WAIVER
OF JURY TRIAL. EACH OF THE PARTIES IRREVOCABLY WAIVES ANY AND ALL RIGHTS TO TRIAL BY JURY IN ANY ACTION OR PROCEEDING BETWEEN
THE PARTIES ARISING OUT OF OR RELATING TO THIS AGREEMENT AND THE TRANSACTIONS CONTEMPLATED BY THIS AGREEMENT.

 

    	6

     

    

 

(j)       Successors.
This Agreement and all of the provisions hereof shall be binding upon and inure to the benefit of the parties hereto and their
respective successors and permitted assigns

 

(k)       Cooperation.
Each of the Selling Stockholders and the Company agrees to reasonably cooperate with the other parties and, at their own cost,
time being of the essence, to execute and deliver such further documents, certificates, agreements and instruments and to take
such other actions as may be reasonably requested by such party to evidence or reflect the transactions contemplated by this Agreement
and to carry out the intent and purpose of this Agreement.

 

(l)       Severability.
If any term or other provision of this Agreement is held invalid or unenforceable by any court of competent jurisdiction, the
other provisions of this Agreement will remain in full force and effect so long as the economic or legal substance of this Agreement
is not affected in any manner materially adverse to any party. Upon such determination that any term or other provision is invalid,
illegal or incapable of being enforced, the parties hereto shall negotiate in good faith to modify this Agreement so as to effect
the original intent of the parties as closely as possible in a mutually acceptable manner in order that the terms of this Agreement
remain as originally contemplated to the fullest extent possible.

 

(m)       
Specific Performance; Injunctive Relief. The parties hereto acknowledge that the parties shall be irreparably harmed and
that there shall be no adequate remedy at law for a violation of any of the covenants or agreements of the other parties set forth
in this Agreement. Therefore, each party hereby agrees that, in addition to any other remedies that may be available to the Selling
Stockholders or the Company, as applicable upon any such violation, such party shall have the right to enforce such covenants
and agreements by specific performance, injunctive relief or by any other means to which they are entitled at law or in equity.

 

(n)       Representation.
This Agreement was negotiated by the parties with the benefit of legal representation, or such representation was affirmatively
considered and not sought, and any rule of construction or interpretation otherwise requiring this Agreement to be construed or
interpreted against any party shall not apply to any construction or interpretation thereof.

 

(Signature
Page Follow)

 

    	7

     

    

 

IN
WITNESS WHEREOF, the parties have executed this Preferred Stock Option Agreement as of the date first written above.

 

	COMPANY:	 
	 	 	 
	Surna
    Inc.	 
	A
    Nevada corporation	 
	 	 	 
	By:	/s/
    Chris Bechtel	 
	Name:
    	Chris
    Bechtel	 
	Title:	Chief
    Executive Officer	 
	 	 	 
	SELLING
    STOCKHOLDERS:	 
	 	 	 
	By:	/s/
Stephen B. Keen	 
	Name:	Stephen
    B. Keen	 
	 	 	 
	By:	/s/
    Brandy M. Keen	 
	Name:	Brandy
    M. Keen	 

 

    	8

     

    

 

Exhibit
A

 

NOTICE
OF EXERCISE

 

TO:
Selling Stockholders

 

The
undersigned, on behalf of Surna Inc. (the “Company”), hereby exercises the option to purchase __________ shares of
Preferred Stock of the Company, as provided in the Preferred Stock Option Agreement dated as of May 29, 2018, against delivery
of _____________ shares of Common Stock of the Company.

 

The
undersigned hereby represents and warrants that it is the Company’s intention to acquire the aforesaid shares of Preferred
Stock of the Company for its own account.

 

	Surna
    Inc.	 
	 	 
	By:
_______________________    	 
	 	 
	Name
    (print): _______________________	 
	 	 
	Title:
____________________________    	 
	 	 
	Dated:
___________________________

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