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Exhibit 4.2    
    

        THIS NOTE AND THE COMMON SHARES ISSUABLE UPON CONVERSION OF THIS NOTE HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS
AMENDED. THIS NOTE AND THE COMMON SHARES ISSUABLE UPON CONVERSION OF THIS NOTE MAY NOT BE SOLD, OFFERED FOR SALE, PLEDGED OR HYPOTHECATED IN THE ABSENCE OF AN EFFECTIVE REGISTRATION STATEMENT AS TO
THIS NOTE UNDER SAID ACT OR AN OPINION OF COUNSEL REASONABLY SATISFACTORY TO DIGITAL ANGEL CORPORATION, THAT SUCH REGISTRATION IS NOT REQUIRED.

 
 

SECURED MINIMUM BORROWING CONVERTIBLE NOTE    
    

        FOR VALUE RECEIVED, DIGITAL ANGEL CORPORATION, a Delaware corporation (hereinafter called "Borrower") promises to
pay to LAURUS MASTER FUND, LTD., c/o Ironshore Corporate Services Ltd., P.O. Box 1234 G.T., Queensgate House, South Church Street, Grand Cayman, Cayman Islands, Fax:
345-949-9877 (the "Holder") or its registered assigns, on order, without demand, the sum of ONE MILLION FIVE HUNDRED THOUSAND
DOLLARS ($1,500,000) (the "Principal Amount"), together with any accrued and unpaid interest, on August 28, 2006 (the
"Maturity Date"). 

        Capitalized
terms used herein without definition shall have the meanings ascribed to such terms in the Security Agreement between Borrower and the Holder dated the date hereof (as
amended, modified and supplemented from time to time, the "Security Agreement"). 

 
 

ARTICLE I    
    
    INTEREST    

        1.1.    Interest Rate.    Interest on this Note shall be payable at an interest rate per annum equal to the Prime Rate
plus two and one half percent (2.5%). 

 
 

ARTICLE II    
    
    ADVANCES, PAYMENTS UNDER NOTE    

        2.1.    Mechanics of Advances.    All Loans evidenced by this Note shall be made in accordance with the terms and
provisions of the Security Agreement. 

        2.2.    Borrower's Conversion Rights.    Subject to adjustment as provided in Sections 3.2 and 3.6 hereof, the
Conversion Price (defined below) per share of Common Stock shall be $2.64 (the "Fixed Conversion Price"). If the Common Stock trades on the principal
trading exchange or market for the Common Stock, (the "Principal Market") at a price greater than 110% of the Fixed Conversion Price for a period of at
least eleven (11) consecutive trading days, then the Borrower may, at its sole option, provide the Holder irrevocable written notice ("Call
Notice") requiring the conversion at the Fixed Conversion Price of all or a portion of the Note held by the Holder (subject to the limitation provided for in Section 3.3
hereof) as of the date set forth in such Call Notice (the "Call Date"). The Call Date shall be at least eleven (11) trading days following the
date of the Call Notice, provided a registration statement covering resales of that number of Conversion Shares provided for in the Call Notice has been declared effective and is available for use.
The number of Conversion Shares to be issued in connection with any such conversion pursuant to a particular Call Notice pursuant to this Section 2.2 shall not exceed 25% of the aggregate
dollar trading volume of the Common Stock for the eleven (11) trading days immediately preceding the Call Date. If the price of the Common Stock falls below 110% of the Conversion Price during
the eleven (11) trading day period preceding the Call Date, then the Holder will be required to convert only such amount of the Note pursuant to such Call Notice as will equal twenty five
percent (25%) of the aggregate dollar trading volume for each day during such 11 day period that the closing price of the Common Stock was greater than one hundred ten percent (110%) of the
then applicable Fixed Conversion Price. The Borrower shall not be permitted to give the Investor more than one Call Notice during any twenty-two (22) day period 

 

 
 

ARTICLE III    
    
    CONVERSION RIGHTS    

        3.1.    Holder's Conversion Rights.    Subject to the terms of this Article III, the Holder shall have the
right, but not the obligation, at any time beginning on May28, 2004 until the Maturity Date, including at any time prior to a Prepayment Date, or thereafter during an Event of Default (as defined in
Article V), to convert all or any portion of the outstanding Principal Amount (subject to the volume restriction set forth in Section 3.3 hereof) and/or accrued interest and fees due and
payable into fully paid and nonassessable shares of Borrower's common stock, as currently constituted (the "Common Stock"), at the conversion price set
forth in Section 3.2 (the "Conversion Price"). The shares of Common Stock to be issued upon such conversion are herein referred to as the
"Conversion Shares." 

        3.2.    Conversion Price Adjustment.    The Fixed Conversion Price shall be adjusted upward (as hereafter provided)
immediately following each conversion under Sections 2.2 and/or 3.1 hereof (calculated on a cumulative basis) of $2,000,000 (each, a "Specified Event"). Following the occurrence of each Specified
Event, the Fixed Conversion Price shall be equal to 110% of the average closing prices for the Common Stock on the Principal Market, or on any securities exchange or other securities market on which
the Common Stock is then being listed or traded, for the three (3) trading days immediately prior to the occurrence of the Specified Event. 

        3.3.    Conversion Limitation.    Notwithstanding anything contained herein to the contrary, the Holder shall not be
entitled to convert pursuant to the terms of this Note an amount that would be convertible into that number of Conversion Shares which would exceed the difference between the number of shares of
Common Stock beneficially owned by such Holder or issuable upon exercise of warrants held by such Holder and 4.99% of the outstanding shares of Common Stock of the Borrower. For the purposes of the
immediately preceding sentence, beneficial ownership shall be determined in accordance with Section 13(d) of the Exchange Act and Regulation 13d-3 thereunder. The Holder may
void the Conversion Share limitation described in this Section 3.3 upon 75 days' prior notice to the Borrower or without any notice requirement upon an Event of Default. 

        3.4.    Mechanics of Conversion.    In the event that the Holder elects to convert this Note into Common Stock, the
Holder shall give notice of such election by delivering an executed and completed notice of conversion ("Notice of Conversion") to the Borrower, and
such Notice of Conversion shall provide a breakdown in reasonable detail of the amount of Principal Amount, accrued interest and fees that are being converted. On each Conversion Date (as hereinafter
defined), and in accordance with its Notice of Conversion, the Holder shall make the appropriate reduction to the Principal Amount, accrued interest and fees as entered in its records and shall
provide written notice thereof to the Borrower within two (2) Business Days after the Conversion Date. Each date on which a Notice of Conversion is delivered or telecopied to the Borrower in
accordance with the provisions hereof shall be deemed a
Conversion Date (the "Conversion Date"). A form of Notice of Conversion that may be employed by the Holder is annexed hereto as Exhibit A. The
Borrower will cause the transfer agent to transmit the certificates representing the Conversion Shares to the Holder by crediting the account of the Holder's designated broker with the Depository
Trust Corporation ("DTC") through its Deposit Withdrawal Agent Commission ("DWAC") system within three (3) Business Days after receipt by the
Borrower of the Notice of Conversion (the "Delivery Date"). 

        In
the case of the exercise of the conversion rights set forth herein, the conversion privilege shall be deemed to have been exercised and the Conversion Shares issuable upon such
conversion shall be deemed to have been issued upon the date of receipt by the Borrower of the Notice of Conversion. The Holder shall be treated for all purposes as the record holder of such Common
Stock, unless the Holder provides the Borrower written instructions to the contrary. 

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        3.5.    Late Payments.    The Borrower understands that a delay in the delivery of the shares of Common Stock in the
form required pursuant to this Article beyond the Delivery Date could result in economic loss to the Holder. As compensation to the Holder for such loss, the Borrower agrees to pay late payments to
the Holder for late issuance of such shares in the form required pursuant to this Article III upon conversion of the Note in the amount equal to the greater of (i) $500 per Business Day
after the Delivery Date and (ii) the Holder's actual damages from such delayed delivery. The Borrower shall pay any payments incurred under this Section in immediately available funds upon
demand and, in the case of actual damages, accompanied by reasonable documentation of the amount of such damages. 

        3.6.    Adjustment Provisions.    The Fixed Conversion Price and number and kind of shares or other securities to be
issued upon conversion determined pursuant to Sections 3.1 and 3.2 shall be subject to adjustment from time to time upon the happening of certain events while this conversion right remains
outstanding, as follows: 

        A.    Reclassification, etc.    If the Borrower at any time shall, by reclassification or otherwise, change the Common
Stock into the same or a different number of securities of any class or classes, this Note, as to the unpaid Principal Amount and accrued interest thereon, shall thereafter be deemed to evidence the
right to purchase an adjusted number of such securities and kind of securities as would have been issuable as the result of such change with respect to the Common Stock immediately prior to such
reclassification or other change. 

        B.    Stock Splits, Combinations and Dividends.    If the shares of Common Stock are subdivided or combined into a
greater or smaller number of shares of Common Stock, or if a dividend is paid on the Common Stock in shares of Common Stock, the Fixed Conversion Price shall be proportionately reduced in case of
subdivision of shares or stock dividend or proportionately increased in the case of combination of shares, in each such case by the ratio which the total number of shares of Common Stock outstanding
immediately after such event bears to the total number of shares of Common Stock outstanding immediately prior to such event. 

        C.    Share Issuances.    Subject to the provisions of this Section 3.6, if the Borrower shall at any time
prior to the conversion or repayment in full of the Principal Amount issue any shares of Common Stock to a person other than the Holder (otherwise than (i) pursuant to Subsections A or B above;
(ii) pursuant to options, warrants, or other obligations to issue shares outstanding on the date hereof as disclosed to Holder in writing; or (iii) pursuant to options that may be issued
under any employee incentive stock option and/or any qualified stock option plan adopted by the Borrower) for a consideration per share (the "Offer Price") less than the Fixed Conversion Price in
effect at the time of such issuance, the Fixed Conversion Price shall, simultaneously with the happening of such event, be adjusted by multiplying the then current Fixed Conversion Price by a
fraction, the numerator of which shall be the number of shares of Common Stock outstanding immediately prior to such event and the denominator of which shall be the number of shares of Common Stock
outstanding immediately after such event, and the product so obtained shall thereafter be the Fixed Conversion Price then in effect. The Fixed Conversion Price, as so adjusted, shall be readjusted in
the same manner upon the happening of any successive event or events described herein in this subsection C. For purposes hereof, the issuance of any security of the Borrower convertible into or
exercisable or exchangeable for Common Stock shall result in an adjustment to the Fixed Conversion Price only upon the conversion, exercise or exchange of such securities. 

        D.    Computation of Consideration.    For purposes of any computation respecting consideration received pursuant to
Subsection C above, the following shall apply: 

        (a)   in
the case of the issuance of shares of Common Stock for cash, the consideration shall be the amount of such cash, provided that in no case shall any deduction be made
for 

3

 

any
commissions, discounts or other expenses incurred by the Borrower for any underwriting of the issue or otherwise in connection therewith; 

        (b)   in
the case of the issuance of shares of Common Stock for a consideration in whole or in part other than cash, the consideration other than cash shall be deemed to be
the fair market value thereof as determined in good faith by the Board of Directors of the Borrower (irrespective of the accounting treatment thereof); and 

        (c)   in
the case of the issuance of securities convertible into or exchangeable for shares of Common Stock, the aggregate consideration received therefor shall be deemed to
be the consideration received by the Borrower for the issuance of such securities plus the additional minimum consideration, if any, to be received by the Borrower upon the conversion or exchange
thereof (the consideration in each case to be determined in the same manner as provided in clauses (a) and (b) of this Subsection (D)). 

        3.7.    Reservation of Shares.    During the period the conversion right exists, the Borrower will reserve from its
authorized and unissued Common Stock a sufficient number of shares to provide for the issuance of Common Stock upon the full conversion of this Note. The Borrower represents that upon issuance, such
shares will be duly and validly issued, fully paid and non-assessable. The Borrower agrees that its issuance of this Note shall constitute full authority to its officers, agents, and
transfer agents who are charged with the duty of executing and issuing stock certificates to execute and issue the necessary certificates for shares of Common Stock upon the conversion of this Note. 

        3.8.    Registration Rights.    The Holder has been granted registration rights with respect to the shares of Common
Stock issuable upon conversion of this Note as more fully set forth in a Registration Rights Agreement dated the date hereof. 

 
 

ARTICLE IV    
    
    EVENTS OF DEFAULT    

        The
occurrence of any of the following events is an Event of Default ("Event of Default"): 

        4.1.    Failure to Pay Principal, Interest or other Fees.    The Borrower fails to pay any installment of principal,
interest or other fees hereon or on any other promissory note issued pursuant to the Security Agreement, when due: provided however, that the Borrower shall have a period of three (3) Business
Days in which to cure such failure to pay such monetary amounts. 

        4.2.    Breach of Covenant.    The Borrower breaches any covenant or other term or condition of this Note in any
material respect and such breach, if subject to cure, continues for a period of ten (10) days after the occurrence thereof. 

        4.3.    Breach of Representations and Warranties.    Any material representation or warranty of the Borrower made
herein, or in any agreement, statement or certificate given in writing pursuant hereto or in connection herewith shall be false or misleading. 

        4.4.    Stop Trade.    An SEC stop trade order or Principal Market trading suspension of the Common Stock for five
(5) consecutive trading days or five (5) trading days during a period of ten (10) consecutive days, excluding in all cases a suspension of all trading on a Principal Market. 

        4.5.    Default Under Related Agreement.    The occurrence of an Event of Default under and as defined in the Security
Agreement. 

4

 
 
 

ARTICLE V    
    
    DEFAULT PAYMENTS    

        5.1.    Default Payment.    If an Event of Default occurs and is continuing beyond any applicable cure period, the
Holder, at its option, may elect, in addition to all rights and remedies of Holder under the Security Agreement and all obligations of Borrower under the Security Agreement, to require the Borrower to
make a Default Payment ("Default Payment"). The Default Payment shall be 105% of the outstanding principal amount of the Note, plus accrued but unpaid
interest, all other fees then remaining unpaid, and all other amounts payable hereunder. The Default Payment shall be applied, at the Holder's discretion, first any fees due and owing to Holder, then
to accrued and unpaid interest and then principal outstanding under this Note. 

        5.2.    Default Payment Date and Default Notice Period.    The Default Payment shall be due and payable on the fifth
business day after the date written notice is sent from the Holder to the Borrower of an Event of Default as defined in Article IV ("Default Payment
Date"). The period between the date of the written notice from the Holder to the Borrower of an Event of Default and the Default Payment Date shall be the
"Default Notice Period." If during the Default Notice Period, the Borrower cures the Event of Default, the Event of Default will no longer exist and any
rights the Holder had pertaining to the Event of Default will no longer exist. If the Event of Default is not cured during the Default Notice Period, all amounts payable hereunder shall be due and
payable on the Default Payment Date, all without further demand, presentment or notice, or grace period, all of which hereby are expressly waived. 

        5.3.    Default Interest Rate.    Following the occurrence and during the continuance of an Event of Default, the then
current interest rate on this Note shall automatically be increased by five percent (5%) per annum and all outstanding Obligations, including unpaid interest, shall continue to accrue interest from
the date of such Event of Default at such default interest rate applicable to such Obligations until such Event of Default is cured or waived. 

        5.4.    Cumulative Remedies.    The remedies under this Note shall be cumulative. 

 
 

ARTICLE VI    
    
    MISCELLANEOUS    

        6.1.    Failure or Indulgence Not Waiver.    No failure or delay on the part of the Holder hereof in the exercise of
any power, right or privilege hereunder shall operate as a waiver thereof, nor shall any single or partial exercise of any such power, right or privilege preclude other or further exercise thereof or
of any other right, power or privilege. All rights and remedies existing hereunder are cumulative to, and not exclusive of, any rights or remedies otherwise available. 

        6.2.    Notices.    Any notice herein required or permitted to be given shall be in writing and provided in accordance
with the terms of the Security Agreement. 

        6.3.    Amendment Provision.    The term "Note" and all reference thereto, as used throughout this instrument, shall
mean this instrument as originally executed, or if later amended or supplemented, then as so amended or supplemented. 

        6.4.    Assignability.    This Note shall be binding upon the Borrower and its successors and assigns, and shall inure
to the benefit of the Holder and its successors and assigns, and may be assigned by the Holder with five (5) days' prior written notice to Borrower. 

        6.5.    Costs of Collection.    If default is made in the payment of this Note, the Borrower shall pay the Holder
hereof reasonable costs of collection, including reasonable attorneys' fees. 

5

 

        6.6.    Governing Law.    THIS NOTE SHALL BE GOVERNED BY AND CONSTRUED AND ENFORCED IN ACCORDANCE WITH THE LAWS OF THE
STATE OF NEW YORK APPLICABLE TO CONTRACTS MADE AND PERFORMED IN SUCH STATE WITHOUT REGARD TO THE CONFLICT OF LAWS PROVISIONS THEREOF. BORROWER HEREBY CONSENTS AND AGREES THAT THE STATE OR FEDERAL
COURTS LOCATED IN THE COUNTY OF NEW YORK, STATE OF NEW YORK, SHALL HAVE EXCLUSIVE JURISDICTION TO HEAR AND DETERMINE ANY CLAIMS OR DISPUTES BETWEEN BORROWER AND HOLDER PERTAINING TO THIS AGREEMENT OR
ANY OF THE ANCILLARY AGREEMENTS OR AS TO ANY MATTER ARISING OUT OF OR RELATED TO THIS AGREEMENT OR ANY OF THE ANCILLARY AGREEMENTS; PROVIDED, THAT
HOLDER AND BORROWER ACKNOWLEDGE THAT ANY APPEALS FROM THOSE COURTS MAY HAVE TO BE HEARD BY A COURT LOCATED OUTSIDE OF THE COUNTY OF NEW YORK, STATE OF NEW YORK; AND FURTHER
PROVIDED, THAT NOTHING IN THIS AGREEMENT SHALL BE DEEMED OR OPERATE TO PRECLUDE HOLDER FROM BRINGING SUIT OR TAKING OTHER LEGAL ACTION IN ANY OTHER JURISDICTION TO COLLECT THE
OBLIGATIONS, TO REALIZE ON THE COLLATERAL OR ANY OTHER SECURITY FOR THE OBLIGATIONS, OR TO ENFORCE A JUDGMENT OR OTHER COURT ORDER IN FAVOR OF HOLDER. BORROWER EXPRESSLY SUBMITS AND CONSENTS IN
ADVANCE TO SUCH JURISDICTION IN ANY ACTION OR SUIT COMMENCED IN ANY SUCH COURT, AND BORROWER HEREBY WAIVES ANY OBJECTION WHICH IT MAY HAVE BASED UPON LACK OF PERSONAL JURISDICTION, IMPROPER VENUE OR  FORUM NON
CONVENIENS. BORROWER HEREBY WAIVES PERSONAL SERVICE OF THE SUMMONS, COMPLAINT AND OTHER PROCESS ISSUED IN ANY SUCH ACTION OR SUIT AND AGREES
THAT SERVICE OF SUCH SUMMONS, COMPLAINT AND OTHER PROCESS MAY BE MADE BY REGISTERED OR CERTIFIED MAIL, ADDRESSED TO BORROWER, AND THAT SERVICE SO MADE SHALL BE DEEMED COMPLETED UPON THE EARLIER OF
BORROWER'S ACTUAL RECEIPT THEREOF OR THREE (3) DAYS AFTER DEPOSIT IN THE U.S. MAILS, PROPER POSTAGE PREPAID. THE PARTIES DESIRE THAT THEIR DISPUTES BE RESOLVED BY A JUDGE APPLYING SUCH
APPLICABLE LAWS. THEREFORE, TO ACHIEVE THE BEST COMBINATION OF THE BENEFITS OF THE JUDICIAL SYSTEM AND OF ARBITRATION, THE PARTIES HERETO WAIVE ALL RIGHTS TO TRIAL BY JURY IN ANY ACTION, SUIT, OR
PROCEEDING BROUGHT TO RESOLVE ANY DISPUTE, WHETHER ARISING IN CONTRACT, TORT, OR OTHERWISE BETWEEN HOLDER AND BORROWER ARISING OUT OF, CONNECTED WITH, RELATED OR INCIDENTAL TO THE RELATIONSHIP
ESTABLISHED BETWEEN THEM IN CONNECTION WITH THIS AGREEMENT, ANY ANCILLARY AGREEMENT OR THE TRANSACTIONS RELATED THERETO. THE PREVAILING PARTY SHALL BE ENTITLED TO RECOVER FROM THE OTHER PARTY ITS
REASONABLE ATTORNEY'S FEES AND COSTS. IN THE EVENT THAT ANY PROVISION OF THIS NOTE IS INVALID OR UNENFORCEABLE UNDER ANY APPLICABLE STATUTE OR RULE OF LAW, THEN SUCH PROVISION SHALL BE DEEMED
INOPERATIVE TO THE EXTENT THAT IT MAY CONFLICT THEREWITH AND SHALL BE DEEMED MODIFIED TO CONFORM WITH SUCH STATUTE OR RULE OF LAW. ANY SUCH PROVISION WHICH MAY PROVE INVALID OR UNENFORCEABLE UNDER ANY
LAW SHALL NOT AFFECT THE VALIDITY OR UNENFORCEABILITY OF ANY OTHER PROVISION OF THIS NOTE. NOTHING CONTAINED HEREIN SHALL BE DEEMED OR OPERATE TO PRECLUDE HOLDER FROM BRINGING SUIT OR TAKING OTHER
LEGAL ACTION AGAINST THE BORROWER IN ANY OTHER JURISDICTION TO COLLECT ON THE BORROWER'S OBLIGATIONS TO HOLDER, TO REALIZE ON ANY COLLATERAL OR ANY OTHER SECURITY FOR SUCH OBLIGATIONS, OR TO ENFORCE A
JUDGMENT OR OTHER COURT ORDER IN FAVOR OF HOLDER.. 

6

 

        6.7.    Maximum Payments.    Nothing contained herein shall be deemed to establish or require the payment of a rate of
interest or other charges in excess of the maximum permitted by applicable law. In the event that the rate of interest required to be paid or other charges hereunder exceed the maximum permitted by
such law, any payments in excess of such maximum shall be credited against amounts owed by the Borrower to the Holder and thus refunded to the Borrower. 

        6.8.    Security Interest.    The Holder of this Note has been granted a security interest in certain assets of the
Borrower more fully described in the Security Agreement. 

        6.9.    Construction.    Each party acknowledges that its legal counsel participated in the preparation of this Note
and, therefore, stipulates that the rule of construction that ambiguities are to be resolved against the drafting party shall not be applied in the interpretation of this Note to favor any party
against the other. 

7

 

        IN WITNESS WHEREOF, the Borrower has caused this Note to be signed in its name effective as of this 28th day of August, 2003. 

	 	 	DIGITAL ANGEL CORPORATION
	

 	
 	

By:	
 	

/s/  JAMES P. SANTELLI      

	

WITNESS:	
 	

 	
 	

 
	

/s/  REBECCA S. THOMPSON      
	
 	

 	
 	

 

8

 
 
 

NOTICE OF CONVERSION    
    

(To
be executed by the Holder in order to convert the Note) 

        The
undersigned hereby elects to convert $                              of the principal and
$                                         
 of the interest due on the Note issued by DIGITAL ANGEL
CORPORATION on            , 2003 into Shares of Common Stock of DIGITAL ANGEL CORPORATION (the "Borrower") according to the conditions set forth in such Note, as of the date written below.

Date
of Conversion: 

Conversion
Price: 

Shares
To Be Delivered: 

Signature:

Print
Name: 

Address:

9

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Exhibit 4.2

SECURED MINIMUM BORROWING CONVERTIBLE NOTE

ARTICLE I INTEREST

ARTICLE II ADVANCES, PAYMENTS UNDER NOTE

ARTICLE III CONVERSION RIGHTS

ARTICLE IV EVENTS OF DEFAULT

ARTICLE V DEFAULT PAYMENTS

ARTICLE VI MISCELLANEOUS

NOTICE OF CONVERSIONQuickLinks
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Exhibit 4.3    
    

        THIS NOTE AND THE COMMON SHARES ISSUABLE UPON CONVERSION OF THIS NOTE HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS
AMENDED. THIS NOTE AND THE COMMON SHARES ISSUABLE UPON CONVERSION OF THIS NOTE MAY NOT BE SOLD, OFFERED FOR SALE, PLEDGED OR HYPOTHECATED IN THE ABSENCE OF AN EFFECTIVE REGISTRATION STATEMENT AS TO
THIS NOTE UNDER SAID ACT OR AN OPINION OF COUNSEL REASONABLY SATISFACTORY TO DIGITAL ANGEL CORPORATION, THAT SUCH REGISTRATION IS NOT REQUIRED.

 
 

SECURED REVOLVING CONVERTIBLE NOTE    
    

        FOR VALUE RECEIVED, DIGITAL ANGEL CORPORATION, a Delaware corporation (hereinafter called "Borrower") promises to
pay to LAURUS MASTER FUND, LTD., c/o Ironshore Corporate Services Ltd., P.O. Box 1234 G.T., Queensgate House, South Church Street, Grand Cayman, Cayman Islands, Fax:
345-949-9877 (the "Holder") or its registered assigns, on order, without demand, the sum of up to THREE MILLION FIVE HUNDRED
THOUSAND DOLLARS ($3,500,000) (the "Principal Amount"), together with any accrued and unpaid interest, on August 28, 2006 (the
"Maturity Date"). 

        Capitalized
terms used herein without definition shall have the meanings ascribed to such terms in the Security Agreement between Borrower and the Holder dated the date hereof (as
amended, modified and supplemented from time to time, the "Security Agreement"). 

 
 

ARTICLE I    
    
    INTEREST    

        1.1.    Interest Rate.    Interest on this Note shall be payable at an interest rate per annum equal to the Prime Rate
plus two and one half percent (2.5%). 

 
 

ARTICLE II    
    
    ADVANCES, PAYMENTS UNDER NOTE    

        2.1.    Mechanics of Advances.    All Loans evidenced by this Note shall be made in accordance with the terms and
provisions of the Security Agreement. 

        2.2.    Borrower's Conversion Rights.    Subject to adjustment as provided in Sections 3.2 and 3.6 hereof, the
Conversion Price (defined below) per share of Common Stock shall be $2.64 (the "Fixed Conversion Price"). If the Common Stock trades on the principal
trading exchange or market for the Common Stock, (the "Principal Market") at a price greater than 110% of the Fixed Conversion Price for a period of at
least eleven (11) consecutive trading days, then the Borrower may, at its sole option, provide the Holder irrevocable written notice ("Call
Notice") requiring the conversion at the Fixed Conversion Price of all or a portion of the Note held by the Holder (subject to the limitation provided for in Section 3.3
hereof) as of the date set forth in such Call Notice (the "Call Date"). The Call Date shall be at least eleven (11) trading days following the
date of the Call Notice, provided a registration statement covering resales of that number of Conversion Shares provided for in the Call Notice has been declared effective and is available for use.
The number of Conversion Shares to be issued in connection with any such conversion pursuant to a particular Call Notice pursuant to this Section 2.2 shall not exceed 25% of the aggregate
dollar trading volume of the Common Stock for the eleven (11) trading days immediately preceding the Call Date. If the price of the Common Stock falls below 110% of the Conversion Price during
the eleven (11) trading day period preceding the Call Date, then the Holder will be required to convert only such amount of the Note pursuant to such Call Notice as will equal twenty five
percent (25%) of the aggregate dollar trading volume for each day during such 11 day period that the closing price of the Common Stock was greater than one hundred ten percent 

 

(110%)
of the then applicable Fixed Conversion Price. The Borrower shall not be permitted to give the Investor more than one Call Notice during any twenty-two (22) day period 

 
 

ARTICLE III    
    
    CONVERSION RIGHTS    

        3.1.    Holder's Conversion Rights.    Subject to the terms of this Article III, the Holder shall have the
right, but not the obligation, at any time beginning on May28, 2004 until the Maturity Date, including at any time prior to a Prepayment Date, or thereafter during an Event of Default (as defined in
Article V), to convert all or any portion of the outstanding Principal Amount (subject to the volume restriction set forth in Section 3.3 hereof) and/or accrued interest and fees due and
payable into fully paid and nonassessable shares of Borrower's common stock, as currently constituted (the "Common Stock"), at the conversion price set
forth in Section 3.2 (the "Conversion Price"). The shares of Common Stock to be issued upon such conversion are herein referred to as the
"Conversion Shares." 

        3.2.    Conversion Price Adjustment.    The Fixed Conversion Price shall be adjusted upward (as hereafter provided)
immediately following each conversion under Sections 2.2 and/or 3.1 hereof (calculated on a cumulative basis) of $2,000,000 (each, a "Specified Event"). Following the occurrence of each Specified
Event, the Fixed Conversion Price shall be equal to 110% of the average closing prices for the Common Stock on the Principal Market, or on any securities exchange or other securities market on which
the Common Stock is then being listed or traded, for the three (3) trading days immediately prior to the occurrence of the Specified Event. 

        3.3.    Conversion Limitation.    Notwithstanding anything contained herein to the contrary, the Holder shall not be
entitled to convert pursuant to the terms of this Note an amount that would be convertible into that number of Conversion Shares which would exceed the difference between the number of shares of
Common Stock beneficially owned by such Holder or issuable upon exercise of warrants held by such Holder and 4.99% of the outstanding shares of Common Stock of the Borrower. For the purposes of the
immediately preceding sentence, beneficial ownership shall be determined in accordance with Section 13(d) of the Exchange Act and Regulation 13d-3 thereunder. The Holder may
void the Conversion Share limitation described in this Section 3.3 upon 75 days' prior notice to the Borrower or without any notice requirement upon an Event of Default. 

        3.4.    Mechanics of Conversion.    In the event that the Holder elects to convert this Note into Common Stock, the
Holder shall give notice of such election by delivering an executed and completed notice of conversion ("Notice of Conversion") to the Borrower, and
such Notice of Conversion shall provide a breakdown in reasonable detail of the amount of Principal Amount, accrued interest and fees that are being converted. On each Conversion Date (as hereinafter
defined), and in accordance with its Notice of Conversion, the Holder shall make the appropriate reduction to the Principal Amount, accrued interest and fees as entered in its records and shall
provide written notice thereof to the Borrower within two (2) Business Days after the Conversion Date. Each date on which a Notice of Conversion is delivered or telecopied to the Borrower in
accordance with the provisions hereof shall be deemed a
Conversion Date (the "Conversion Date"). A form of Notice of Conversion that may be employed by the Holder is annexed hereto as Exhibit A. The
Borrower will cause the transfer agent to transmit the certificates representing the Conversion Shares to the Holder by crediting the account of the Holder's designated broker with the Depository
Trust Corporation ("DTC") through its Deposit Withdrawal Agent Commission ("DWAC") system within three (3) Business Days after receipt by the
Borrower of the Notice of Conversion (the "Delivery Date"). 

        In
the case of the exercise of the conversion rights set forth herein, the conversion privilege shall be deemed to have been exercised and the Conversion Shares issuable upon such
conversion shall be deemed to have been issued upon the date of receipt by the Borrower of the Notice of Conversion. 

2

 

The
Holder shall be treated for all purposes as the record holder of such Common Stock, unless the Holder provides the Borrower written instructions to the contrary. 

        3.5.    Late Payments.    The Borrower understands that a delay in the delivery of the shares of Common Stock in the
form required pursuant to this Article beyond the Delivery Date could result in economic loss to the Holder. As compensation to the Holder for such loss, the Borrower agrees to pay late payments to
the Holder for late issuance of such shares in the form required pursuant to this Article III upon conversion of the Note in the amount equal to the greater of (i) $500 per Business Day
after the Delivery Date and (ii) the Holder's actual damages from such delayed delivery. The Borrower shall pay any payments incurred under this Section in immediately available funds upon
demand and, in the case of actual damages, accompanied by reasonable documentation of the amount of such damages. 

        3.6.    Adjustment Provisions.    The Fixed Conversion Price and number and kind of shares or other securities to be
issued upon conversion determined pursuant to Sections 3.1 and 3.2 shall be subject to adjustment from time to time upon the happening of certain events while this conversion right remains
outstanding, as follows: 

        A.    Reclassification, etc.    If the Borrower at any time shall, by reclassification or otherwise, change the Common
Stock into the same or a different number of securities of any class or classes, this Note, as to the unpaid Principal Amount and accrued interest thereon, shall thereafter be deemed to evidence the
right to purchase an adjusted number of such securities and kind of securities as would have been issuable as the result of such change with respect to the Common Stock immediately prior to such
reclassification or other change. 

        B.    Stock Splits, Combinations and Dividends.    If the shares of Common Stock are subdivided or combined into a
greater or smaller number of shares of Common Stock, or if a dividend is paid on the Common Stock in shares of Common Stock, the Fixed Conversion Price shall be proportionately reduced in case of
subdivision of shares or stock dividend or proportionately increased in the case of combination of shares, in each such case by the ratio which the total number of shares of Common Stock outstanding
immediately after such event bears to the total number of shares of Common Stock outstanding immediately prior to such event. 

        C.    Share Issuances.    Subject to the provisions of this Section 3.6, if the Borrower shall at any time
prior to the conversion or repayment in full of the Principal Amount issue any shares of Common Stock to a person other than the Holder (otherwise than (i) pursuant to Subsections A or B above;
(ii) pursuant to options, warrants, or other obligations to issue shares outstanding on the date hereof as disclosed to Holder in writing; or (iii) pursuant to options that may be issued
under any employee incentive stock option and/or any qualified stock option plan adopted by the Borrower) for a consideration per share (the "Offer Price") less than the Fixed Conversion Price in
effect at the time of such issuance, the Fixed Conversion Price shall, simultaneously with the happening of such event, be adjusted by multiplying the then current Fixed Conversion Price by a
fraction, the numerator of which shall be the number of shares of Common Stock outstanding immediately prior to such event and the denominator of which shall be the number of shares of Common Stock
outstanding immediately after such event, and the product so obtained shall thereafter be the Fixed Conversion Price then in effect. The Fixed Conversion Price, as so adjusted, shall be readjusted in
the same manner upon the happening of any successive event or events described herein in this subsection C. For purposes hereof, the issuance of any security of the Borrower convertible into or
exercisable or exchangeable for Common Stock shall result in an adjustment to the Fixed Conversion Price only upon the conversion, exercise or exchange of such securities. 

3

 

        D.    Computation of Consideration.    For purposes of any computation respecting consideration received pursuant to
Subsection C above, the following shall apply: 

        (a)   in
the case of the issuance of shares of Common Stock for cash, the consideration shall be the amount of such cash, provided that in no case shall any deduction be made
for any commissions, discounts or other expenses incurred by the Borrower for any underwriting of the issue or otherwise in connection therewith; 

        (b)   in
the case of the issuance of shares of Common Stock for a consideration in whole or in part other than cash, the consideration other than cash shall be deemed to be
the fair market value thereof as determined in good faith by the Board of Directors of the Borrower (irrespective of the accounting treatment thereof); and 

        (c)   in
the case of the issuance of securities convertible into or exchangeable for shares of Common Stock, the aggregate consideration received therefor shall be deemed to
be the consideration received by the Borrower for the issuance of such securities plus the additional minimum consideration, if any, to be received by the Borrower upon the conversion or exchange
thereof (the consideration in each case to be determined in the same manner as provided in clauses (a) and (b) of this Subsection (D)). 

        3.7.    Reservation of Shares.    During the period the conversion right exists, the Borrower will reserve from its
authorized and unissued Common Stock a sufficient number of shares to provide for the issuance of Common Stock upon the full conversion of this Note. The Borrower represents that upon issuance, such
shares will be duly and validly issued, fully paid and non-assessable. The Borrower agrees that its issuance of this Note shall constitute full authority to its officers, agents, and
transfer agents who are charged with the duty of executing and issuing stock certificates to execute and issue the necessary certificates for shares of Common Stock upon the conversion of this Note. 

        3.8.    Registration Rights.    The Holder has been granted registration rights with respect to the shares of Common
Stock issuable upon conversion of this Note as more fully set forth in a Registration Rights Agreement dated the date hereof. 

 
 

ARTICLE IV    
    
    EVENTS OF DEFAULT    

        The
occurrence of any of the following events is an Event of Default ("Event of Default"): 

        4.1.    Failure to Pay Principal, Interest or other Fees.    The Borrower fails to pay any installment of principal,
interest or other fees hereon or on any other promissory note issued pursuant to the Security Agreement, when due: provided however, that the Borrower shall have a period of three (3) Business
Days in which to cure such failure to pay such monetary amounts. 

        4.2.    Breach of Covenant.    The Borrower breaches any covenant or other term or condition of this Note in any
material respect and such breach, if subject to cure, continues for a period of ten (10) days after the occurrence thereof. 

        4.3.    Breach of Representations and Warranties.    Any material representation or warranty of the Borrower made
herein, or in any agreement, statement or certificate given in writing pursuant hereto or in connection herewith shall be false or misleading. 

        4.4.    Stop Trade.    An SEC stop trade order or Principal Market trading suspension of the Common Stock for five
(5) consecutive trading days or five (5) trading days during a period of ten (10) consecutive days, excluding in all cases a suspension of all trading on a Principal Market. 

        4.5.    Default Under Related Agreement.    The occurrence of an Event of Default under and as defined in the Security
Agreement. 

4

 
 
 

ARTICLE V    
    
    DEFAULT PAYMENTS    

        5.1.    Default Payment.    If an Event of Default occurs and is continuing beyond any applicable cure period, the
Holder, at its option, may elect, in addition to all rights and remedies of Holder under the Security Agreement and all obligations of Borrower under the Security Agreement, to require the Borrower to
make a Default Payment ("Default Payment"). The Default Payment shall be 105% of the outstanding principal amount of the Note, plus accrued but unpaid
interest, all other fees then remaining unpaid, and all other amounts payable hereunder. The Default Payment shall be applied, at the Holder's discretion, first any fees due and owing to Holder, then
to accrued and unpaid interest and then principal outstanding under this Note. 

        5.2.    Default Payment Date and Default Notice Period.    The Default Payment shall be due and payable on the fifth
business day after the date written notice is sent from the Holder to the Borrower of an Event of Default as defined in Article IV ("Default Payment
Date"). The period between the date of the written notice from the Holder to the Borrower of an Event of Default and the Default Payment Date shall be the
"Default Notice Period." If during the Default Notice Period, the Borrower cures the Event of Default, the Event of Default will no longer exist and any
rights the Holder had pertaining to the Event of Default will no longer exist. If the Event of Default is not cured during the Default Notice Period, all amounts payable hereunder shall be due and
payable on the Default Payment Date, all without further demand, presentment or notice, or grace period, all of which hereby are expressly waived. 

        5.3.    Default Interest Rate.    Following the occurrence and during the continuance of an Event of Default, the then
current interest rate on this Note shall automatically be increased by five percent (5%) per annum and all outstanding Obligations, including unpaid interest, shall continue to accrue interest from
the date of such Event of Default at such default interest rate applicable to such Obligations until such Event of Default is cured or waived. 

        5.4.    Cumulative Remedies.    The remedies under this Note shall be cumulative. 

 
 

ARTICLE VI    
    
    MISCELLANEOUS    

        6.1.    Failure or Indulgence Not Waiver.    No failure or delay on the part of the Holder hereof in the exercise of
any power, right or privilege hereunder shall operate as a waiver thereof, nor shall any single or partial exercise of any such power, right or privilege preclude other or further exercise thereof or
of any other right, power or privilege. All rights and remedies existing hereunder are cumulative to, and not exclusive of, any rights or remedies otherwise available. 

        6.2.    Notices.    Any notice herein required or permitted to be given shall be in writing and provided in accordance
with the terms of the Security Agreement. 

        6.3.    Amendment Provision.    The term "Note" and all reference thereto, as used throughout this instrument, shall
mean this instrument as originally executed, or if later amended or supplemented, then as so amended or supplemented. 

        6.4.    Assignability.    This Note shall be binding upon the Borrower and its successors and assigns, and shall inure
to the benefit of the Holder and its successors and assigns, and may be assigned by the Holder with five (5) days' prior written notice to Borrower. 

        6.5.    Costs of Collection.    If default is made in the payment of this Note, the Borrower shall pay the Holder
hereof reasonable costs of collection, including reasonable attorneys' fees. 

5

 

        6.6.    Governing Law.    THIS NOTE SHALL BE GOVERNED BY AND CONSTRUED AND ENFORCED IN ACCORDANCE WITH THE LAWS OF THE
STATE OF NEW YORK APPLICABLE TO CONTRACTS MADE AND PERFORMED IN SUCH STATE WITHOUT REGARD TO THE CONFLICT OF LAWS PROVISIONS THEREOF. BORROWER HEREBY CONSENTS AND AGREES THAT THE STATE OR FEDERAL
COURTS LOCATED IN THE COUNTY OF NEW YORK, STATE OF NEW YORK, SHALL HAVE EXCLUSIVE JURISDICTION TO HEAR AND DETERMINE ANY CLAIMS OR DISPUTES BETWEEN BORROWER AND HOLDER PERTAINING TO THIS AGREEMENT OR
ANY OF THE ANCILLARY AGREEMENTS OR AS TO ANY MATTER ARISING OUT OF OR RELATED TO THIS AGREEMENT OR ANY OF THE ANCILLARY AGREEMENTS; PROVIDED, THAT
HOLDER AND BORROWER ACKNOWLEDGE THAT ANY APPEALS FROM THOSE COURTS MAY HAVE TO BE HEARD BY A COURT LOCATED OUTSIDE OF THE COUNTY OF NEW YORK, STATE OF NEW YORK; AND FURTHER
PROVIDED, THAT NOTHING IN THIS AGREEMENT SHALL BE DEEMED OR OPERATE TO PRECLUDE HOLDER FROM BRINGING SUIT OR TAKING OTHER LEGAL ACTION IN ANY OTHER JURISDICTION TO COLLECT THE
OBLIGATIONS, TO REALIZE ON THE COLLATERAL OR ANY OTHER SECURITY FOR THE OBLIGATIONS, OR TO ENFORCE A JUDGMENT OR OTHER COURT ORDER IN FAVOR OF HOLDER. BORROWER EXPRESSLY SUBMITS AND CONSENTS IN
ADVANCE TO SUCH JURISDICTION IN ANY ACTION OR SUIT COMMENCED IN ANY SUCH COURT, AND BORROWER HEREBY WAIVES ANY OBJECTION WHICH IT MAY HAVE BASED UPON LACK OF PERSONAL JURISDICTION, IMPROPER VENUE OR  FORUM NON
CONVENIENS. BORROWER HEREBY WAIVES PERSONAL SERVICE OF THE SUMMONS, COMPLAINT AND OTHER PROCESS ISSUED IN ANY SUCH ACTION OR SUIT AND AGREES
THAT SERVICE OF SUCH SUMMONS, COMPLAINT AND OTHER PROCESS MAY BE MADE BY REGISTERED OR CERTIFIED MAIL, ADDRESSED TO BORROWER, AND THAT SERVICE SO MADE SHALL BE DEEMED COMPLETED UPON THE EARLIER OF
BORROWER'S ACTUAL RECEIPT THEREOF OR THREE (3) DAYS AFTER DEPOSIT IN THE U.S. MAILS, PROPER POSTAGE PREPAID. THE PARTIES DESIRE THAT THEIR DISPUTES BE RESOLVED BY A JUDGE APPLYING SUCH
APPLICABLE LAWS. THEREFORE, TO ACHIEVE THE BEST COMBINATION OF THE BENEFITS OF THE JUDICIAL SYSTEM AND OF ARBITRATION, THE PARTIES HERETO WAIVE ALL RIGHTS TO TRIAL BY JURY IN ANY ACTION, SUIT, OR
PROCEEDING BROUGHT TO RESOLVE ANY DISPUTE, WHETHER ARISING IN CONTRACT, TORT, OR OTHERWISE BETWEEN HOLDER AND BORROWER ARISING OUT OF, CONNECTED WITH, RELATED OR INCIDENTAL TO THE RELATIONSHIP
ESTABLISHED BETWEEN THEM IN CONNECTION WITH THIS AGREEMENT, ANY ANCILLARY AGREEMENT OR THE TRANSACTIONS RELATED THERETO. THE PREVAILING PARTY SHALL BE ENTITLED TO RECOVER FROM THE OTHER PARTY ITS
REASONABLE ATTORNEY'S FEES AND COSTS. IN THE EVENT THAT ANY PROVISION OF THIS NOTE IS INVALID OR UNENFORCEABLE UNDER ANY APPLICABLE STATUTE OR RULE OF LAW, THEN SUCH PROVISION SHALL BE DEEMED
INOPERATIVE TO THE EXTENT THAT IT MAY CONFLICT THEREWITH AND SHALL BE DEEMED MODIFIED TO CONFORM WITH SUCH STATUTE OR RULE OF LAW. ANY SUCH PROVISION WHICH MAY PROVE INVALID OR UNENFORCEABLE UNDER ANY
LAW SHALL NOT AFFECT THE VALIDITY OR UNENFORCEABILITY OF ANY OTHER PROVISION OF THIS NOTE. NOTHING CONTAINED HEREIN SHALL BE DEEMED OR OPERATE TO PRECLUDE HOLDER FROM BRINGING SUIT OR TAKING OTHER
LEGAL ACTION AGAINST THE BORROWER IN ANY OTHER JURISDICTION TO COLLECT ON THE BORROWER'S OBLIGATIONS TO HOLDER, TO REALIZE ON ANY COLLATERAL OR ANY OTHER SECURITY FOR SUCH OBLIGATIONS, OR TO ENFORCE A
JUDGMENT OR OTHER COURT ORDER IN FAVOR OF HOLDER.. 

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        6.7.    Maximum Payments.    Nothing contained herein shall be deemed to establish or require the payment of a rate of
interest or other charges in excess of the maximum permitted by applicable law. In the event that the rate of interest required to be paid or other charges hereunder exceed the maximum permitted by
such law, any payments in excess of such maximum shall be credited against amounts owed by the Borrower to the Holder and thus refunded to the Borrower. 

        6.8.    Security Interest.    The Holder of this Note has been granted a security interest in certain assets of the
Borrower more fully described in the Security Agreement. 

        6.9.    Construction.    Each party acknowledges that its legal counsel participated in the preparation of this Note
and, therefore, stipulates that the rule of construction that ambiguities are to be resolved against the drafting party shall not be applied in the interpretation of this Note to favor any party
against the other. 

7

 

        IN WITNESS WHEREOF, the Borrower has caused this Note to be signed in its name effective as of this 28th day of August, 2003. 

	 	 	DIGITAL ANGEL CORPORATION
	

 	
 	

By:	
 	

/s/  JAMES P. SANTELLI      

	

WITNESS:	
 	

 	
 	

 
	

/s/  REBECCA S. THOMPSON      
	
 	

 	
 	

 

8

 
 
 

NOTICE OF CONVERSION    
    

(To
be executed by the Holder in order to convert the Note) 

        The
undersigned hereby elects to convert
$                                         
 of the principal and
$                                         
 of the interest due on the Note issued by DIGITAL ANGEL
CORPORATION on            , 2003 into Shares of Common Stock of DIGITAL ANGEL CORPORATION (the "Borrower") according to the conditions set forth in such Note, as of the date written below.

Date
of Conversion: 

Conversion
Price: 

Shares
To Be Delivered: 

Signature:

Print
Name: 

Address:

9

QuickLinks

Exhibit 4.3

SECURED REVOLVING CONVERTIBLE NOTE

ARTICLE I INTEREST

ARTICLE II ADVANCES, PAYMENTS UNDER NOTE

ARTICLE III CONVERSION RIGHTS

ARTICLE IV EVENTS OF DEFAULT

ARTICLE V DEFAULT PAYMENTS

ARTICLE VI MISCELLANEOUS

NOTICE OF CONVERSION

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