Document:

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                                                                   EXHIBIT 10.16

                                PLEDGE AGREEMENT

         THIS PLEDGE AGREEMENT (this "Agreement") is made as of the 1st day of
December, 1999, by and between Jeffrey S. Doss ("Debtor"), and Mobility
Electronics, Inc., a Delaware corporation ("Secured Party").

                                    RECITALS

         WHEREAS, concurrently with the execution and delivery of this
Agreement, Debtor has executed and delivered to Secured Party a Promissory Note
(the "Note") in the original principal amount of $300,000.00, bearing interest
and payable as to principal and interest as therein set forth; and

         WHEREAS, the Note evidences the purchase price payable to Secured Party
by Debtor for 50,000 shares of Series C Preferred Stock, par value $0.01 per
share, of Secured Party (the "Preferred Shares"), and a warrant (the "Warrant")
to purchase up to 100,000 shares of the common stock, par value $0.01 per share,
of Secured Party (the "Common Stock"); and

         WHEREAS, Debtor has agreed, on the terms set out herein, to secure the
payment and performance of the Note by granting a security interest in the
Pledged Securities (as hereinafter defined) to the Secured Party;

         NOW, THEREFORE, the parties hereto hereby agree as follows:

                                    AGREEMENT

         1. DEFINITIONS. As used in this Agreement, the following terms shall
have the meaning indicated:

                   (a)  "Pledged Securities" means the Preferred Shares, the
              Warrant and the shares of Common Stock underlying the Preferred
              Shares and the Warrant, and any and all substitutes, replacements,
              accessions, attachments and other additions thereto, and any and
              all proceeds from the sale thereof.

                   (b)  "Secured Indebtedness" means all sums payable under
              the Note and any substitutions, extensions, renewals or
              re-amortizations of the Note.

         2. GRANT OF SECURITY INTEREST IN THE PLEDGED SECURITIES. To secure the
full and punctual payment of the Secured Indebtedness, and upon and subject to
the terms, provisions and conditions of this Agreement, Debtor does hereby grant
Secured Party and its successors and assigns, a security interest (the "Security
Interest") in the Pledged Securities.

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         3. DELIVERY OF SECURITIES TO SECURED PARTY. Simultaneously with the
execution of this Agreement: (i) the stock certificate representing the
Preferred Shares and the Warrant and all other stock certificates and
instruments in registered form which may constitute or evidence at any time or
from time to time a part of the Pledged Securities shall be delivered to the
Secured Party and shall be endorsed in blank for transfer or be accompanied by
proper instruments of assignment and transfer in blank upon delivery; and (ii)
Debtor shall execute and deliver to Secured Party five stock powers, executed in
blank, and one warrant assignment, executed in blank, each in a form acceptable
to Secured Party. Until the happening of an event of Default hereunder, all
certificates and instruments representing the Pledged Securities shall remain
registered in the name of Debtor. So long as the Secured Indebtedness, or any
part thereof, remains outstanding and unpaid, the certificate and instruments
representing the Pledged Securities, shall be held by Secured Party, and Debtor
shall not have the right to procure the release of any of the Pledged Securities
from the lien hereby created except upon and in compliance with the terms and
conditions herein set forth.

         4. COVENANTS OF DEBTOR. Debtor covenants and agrees that Debtor shall
promptly pay and discharge the Secured Indebtedness and any and all other debts,
obligations or liabilities, including expenses and reasonable attorneys' fees,
incurred or paid by Secured Party in exercising or protecting its interests,
rights and remedies hereunder as and when the same shall become due and payable,
either by their own terms or by the exercise by Secured Party of any right or
option which they may ever have to accelerate the maturity thereof.

         5. VOTING OF PLEDGED SECURITIES. Until the occurrence of an event of
Default, the Pledged Securities shall be treated as shares of Debtor and Debtor
shall be entitled to vote at any meeting of the stockholders of Secured Party.
Until the occurrence of an event of Default, no cash dividends shall be payable
to Secured Party on or with respect to the Pledged Securities. Debtor hereby
grants to Secured Party, upon the occurrence of an event of Default hereunder,
the right to vote the Pledged Securities during the continuance of such Default
whether or not Secured Party seek any other remedies available to it under this
Agreement or any applicable law or in equity.

         6. DEFAULT. The term "Default" means an "Event of Default" under the
Note, all of the terms, covenants, conditions and provisions of which are
incorporated in this Agreement by reference the same as if set forth verbatim,
and such terms, covenants, conditions, and provisions shall continue in full
force and effect under this Agreement until the Secured Indebtedness is paid in
and performed in full.

         7. REMEDIES UPON DEFAULT.

                  (a) If any event of Default set forth in Paragraph 6 above
         shall occur, Secured Party may seek any remedies available to them
         under any applicable law.

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                  (b) Except as otherwise provided herein or in the Note, Debtor
         hereby waives notice of Default, presentment for payment, demand,
         notice of dishonor and protest of the Note.

                  (c) In addition, full power and authority are hereby given to
         Secured Party to sell, assign and deliver the whole or any part of the
         Pledged Securities at any broker's board, or at public or private sale,
         at the option of Secured Party, either for cash or on credit or for
         future delivery without assumption of any credit risk, and without
         either demand or advertisement of any kind, both of which are hereby
         waived, and no delay on the part of Secured Party in exercising any
         power of sale or any other rights or option hereunder, and no demand,
         which may be given to or made upon the undersigned by Secured Party to
         a power of sale or other right or option hereunder, shall constitute a
         waiver thereof, or limit or impair the right of Secured Party to take
         any action or to exercise any power of sale or any other rights
         hereunder, without demand, or prejudice the rights of Secured Party as
         against the undersigned in any respect. At any sale of the Pledged
         Securities in accordance with the preceding sentence, Debtor may itself
         purchase the whole or any part of the Pledged Securities sold. In event
         of any sale or other disposition of any of the Pledged Securities,
         after deducting all costs or expenses of every kind for care,
         safekeeping, collection, sale, delivery or otherwise, Secured Party
         shall, after applying the residue of the proceeds of the sale, or other
         disposition thereof, as hereinabove authorized, return any excess to
         Debtor. Secured Party shall notify Debtor in writing of their intent to
         exercise its right to sell the Pledged Securities in accordance with
         this Section 7(c) at least five (5) days prior to any such sale.

                  Because of the Securities Act of 1933, as amended (the
         "Securities Act"), or any other laws or regulations, there may be legal
         restrictions or limitations affecting Secured Party in any attempts to
         dispose of certain portions of the Pledged Securities in the
         enforcement of its rights and remedies hereunder. For these reasons,
         Secured Party is hereby authorized by Debtor, but not obligated, in the
         event any Default hereunder, to sell, bid upon, and purchase all or any
         part of the Pledge Securities at private sale, subject to investment
         letter or in any other commercially reasonable manner which will not
         require the Pledged Securities, or any part thereof, to be registered
         in accordance with the Securities Act, or the rules and regulations
         promulgated thereunder, or any other law or regulation. Debtor
         acknowledges Secured Party may in its discretion approach a restricted
         number of potential purchasers and that a sale under such circumstances
         may yield a lower price of the Pledged Securities or any part or parts
         thereon than would otherwise be obtainable if same were registered and
         sold in the open market.

         8. FURTHER ASSURANCES. Debtor agrees to execute such stock powers and
assignments, endorse such instruments, or execute such additional pledge
agreements or other documents as may be reasonably requested by Secured Party in
order effectively to grant to

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Secured Party the Security Interest in (and pledge and assignment of) the
Pledged Securities and to enforce and exercise Secured Party's rights regarding
same.

         9. ASSIGNABILITY. The rights, powers and interests held by Secured
Party hereunder, together with the Pledged Securities, may be transferred and
assigned by Secured Party in whole or in part. This Agreement may not be
assigned, in whole or in part, by Debtor.

         10. DELIVERY OF PLEDGED SECURITIES. When the Secured Indebtedness has
been paid in full or otherwise satisfied, Secured Party shall deliver the
Pledged Securities to Debtor concurrently with its receipt of such payment or
satisfaction and this Agreement shall terminate.

         11. WAIVER OF DEFAULT. The acceptance by Secured Party at any time and
from time to time of partial payment of the aggregate amount of the Secured
Indebtedness then matured shall not be deemed to be a waiver of any Default then
existing. No waiver by Secured Party of any Default shall be deemed to be a
waiver of any subsequent Default, nor shall any such waiver by Secured Party be
deemed to be a continuing waiver. No delay or omission by Secured Party in
exercising any right or power hereunder, except for the failure by Secured Party
to give notice as provided herein or in the Note or under any other writings
executed by Debtor as security for or in connection with the Note or the Secured
Indebtedness, shall impair such right or power or be construed as a waiver
thereof or any acquiescence therein, nor shall any single or partial exercise of
any such right or power preclude other or further exercise of any other right or
power of Secured Party hereunder.

         12. LAWS APPLICABLE. This Agreement and the rights and obligations of
the parties hereto shall be governed, construed and enforced in accordance with
the laws of the state of Delaware.

         13. NOTICES. Any notice, request, instruction or other document to be
given hereunder or to any party shall be delivered to the address stated below
that party's signature hereto, and shall be deemed to have been given and
received (i) when actually received by the other party, if delivered in person
or by facsimile or (ii) if mailed, on the earlier of the date actually received
or (whether ever received or not) three Business Days (as hereinafter defined)
after a letter containing such notice, certified or registered, with postage
prepaid, addressed to the other party, is deposited in the United States mail.
The address of Secured Party is 7955 East Redfield Road, Scottsdale, Arizona
85260, Attention: President. The address of Debtor is 7955 East Redfield Road,
Scottsdale, Arizona 85260. "Business Day" means every day which is not a
Saturday, Sunday or legal holiday. Either party may change his address for the
purposes of this section by giving notice to that other party.

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         14. COVENANT OF ASSISTANCE. Debtor agrees to execute all such further
documents and take all such further action as may reasonably be requested by
Secured Party in order to better confirm the Security Interest herein granted in
the Pledged Securities.

         15. AMENDMENT. None of the terms or provisions of this Agreement may be
waived, modified or amended, except in writing signed by both parties hereto.

         16. BINDING EFFECT. This Agreement shall be binding on Debtor and
Debtor's successors and assigns and shall inure to the benefit of Secured Party
and its successors and assigns.

         EXECUTED as of the day and year first above written.

                                         /s/ JEFFREY S. DOSS
                                        ---------------------------------
                                        Jeffrey S. Doss

                                        MOBILITY ELECTRONICS, INC.

                                        By: /s/ CHARLES R. MOLLO
                                           ------------------------------
                                           Charles R. Mollo, President<PAGE>   1
                                                                   EXHIBIT 10.17

                                 PROMISSORY NOTE

$300,000.00                                                     December 1, 1999

     FOR VALUE RECEIVED, the undersigned, Jeffrey S. Doss ("Maker"), promises to
pay to the order of Mobility Electronics, Inc., a Delaware corporation
("Payee"), at 7955 East Redfield Road, Scottsdale, Arizona 85260 (or such other
address as Payee may advise Maker in writing), the principal sum of THREE
HUNDRED THOUSAND AND 00/100 DOLLARS ($300,000.00), in lawful currency of the
United States of America, together with interest accrued thereon (calculated on
the basis of a 365-day year) at a rate of 6% per annum from the date hereof
until this Note is paid in full.

         1. Payments. The entire principal balance of, and accrued interest on,
this Note is due and payable in full on December 1, 2001; provided, however,
that the following payments must be made prior to such date: (i) Payee shall
make an interest and principal payment (accrued but unpaid interest first)
within five (5) days after receiving any bonus from Maker, which payment shall
be in an amount equal to the after-tax amount of such bonus; and (ii) upon the
sale of any Pledged Securities (as defined in that certain Pledge Agreement, of
even date herewith, by and between Payee and Maker (the "Pledge Agreement")),
Maker shall make an interest and principal payment (accrued but unpaid interest
first) within five (5) days after such sale, which payment shall be in an amount
equal to the after-tax amount of the proceeds from such sale.

         2. Optional Prepayment. Maker may at its sole option prepay all or any
part of the principal of this Note, or interest thereon, before maturity without
penalty or premium. All such prepayments shall first be applied to accrued
interest under this Note, and the remaining balance of any such prepayments, if
any, shall be applied to principal of this Note.

         3. Security. This Note is secured by a security interest in the Pledged
Securities under the Pledge Agreement. Payee shall be entitled to all benefits
of the remedies and security set forth in the Pledge Agreement.

         4. Events of Default and Remedies. At the option of Payee the entire
principal balance of, together with all accrued and unpaid interest on, this
Note shall at once become due and payable, without further notice or demand,
upon the occurrence at any time of any of the following events of default
("Events of Default"):

                  (i) Failure of Maker to make any payment of principal or
interest when due hereunder, and such failure continues for a period of 2
business days after the receipt by Maker of written notice from Payee of the
occurrence of such failure; or

                  (ii) Failure of Maker to perform any covenant, agreement or
condition contained herein or in the Pledge Agreement, except the failure of
Maker to make any payment of principal

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or interest when due hereunder, and such failure continues for a period of 10
days after the receipt by Maker of written notice from Payee of the occurrence
of such failure; or

                  (iii) Maker shall (a) become insolvent, (b) voluntarily seek,
consent to, acquiesce in the benefit or benefits of any Debtor Relief Law (as
hereinafter defined) or (c) become party to (or be made the subject of) any
proceeding provided by any Debtor Relief Law, other than as a creditor or
claimant, that could suspend or otherwise adversely affect the rights of Payee
granted hereunder (unless in the event such proceeding is involuntary, the
petition instituting the same is dismissed within 90 days of the filing of
same). As used herein, the term "Debtor Relief Law" means the Bankruptcy Code of
the United States of America and all other applicable liquidation,
conservatorship, bankruptcy, moratorium, rearrangement, receivership,
insolvency, reorganization or similar debtor relief laws from time to time in
effect affecting the rights of creditors generally.

         In the event any one or more of the Events of Default specified above
shall have happened, the holder of this Note may (a) enforce its rights, if any,
under this Note and or under the Pledge Agreement and/or (b) proceed to protect
and enforce its rights either by suit in equity and/or by action at law, or by
other appropriate proceedings, whether for the specific performance of any
covenant or agreement contained in this Note or in the Pledge Agreement or in
aid of the exercise of any power or right granted by this Note or the Pledge
Agreement, or to enforce any other legal and equitable right of the holder of
this Note or in the Pledge Agreement.

         5. Waiver. Except as expressly provided herein, Maker, and each surety,
endorser, guarantor and other party ever liable for the payment of any sum of
money payable on this Note, jointly and severally waive demand, presentment,
protest, notice of non-payment, notice of intention to accelerate, notice of
protest and any and all lack of due diligence or delay in collection or the
filing of suit hereon which may occur.

         6. Cumulative Rights. No delay on the part of the holder of this Note
in the exercise of any power or right under this Note shall operate as a waiver
thereof, nor shall a single or partial exercise of any other power or right.
Enforcement by the holder of this Note of any security for the payment hereof
shall not constitute any election by it of remedies so as to preclude the
exercise of any other remedy available to it.

         7. Notices. Any notice or demand given hereunder by the holder hereof
shall be deemed to have been given and received (i) when actually received by
Maker, if delivered in person or by facsimile transmission, or (ii) if mailed,
on the earlier of the date actually received or (whether ever received or not)
three Business Days (as hereinafter defined) after a letter containing such
notice, certified or registered, with postage prepaid, addressed to Maker, is
deposited in the United States mail. The address of Maker is 7955 East Redfield
Road, Scottsdale, Arizona 85260, or such other address as Maker shall advise the
holder hereof by certified or registered letter by this same procedure.
"Business Day" means every day which is not a Saturday, Sunday or legal holiday.

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         8. Successors and Assigns. This Note and all covenants, promises and
agreements contained herein shall be binding upon and inure to the benefit of
the respective legal representatives, personal representatives, devisees, heirs,
successors and assigns of Payee and Maker.

         9. GOVERNING-LAW. THIS NOTE SHALL BE GOVERNED BY AND CONSTRUED IN
ACCORDANCE WITH THE LAWS OF THE STATE OF DELAWARE. IN CASE ANY ONE OR MORE OF
THE PROVISIONS CONTAINED IN THIS NOTE SHALL FOR ANY REASON BE HELD TO BE
INVALID, ILLEGAL OR UNENFORCEABLE IN ANY RESPECT, SUCH INVALIDITY, ILLEGALITY OR
UNENFORCEABILITY SHALL NOT AFFECT ANY OTHER PROVISION HEREOF.

         10. Usury Savings Clause. Any provision in this Note or in any other
document executed in connection herewith, or in any other agreement or
commitment, whether written or oral, express or implied, to the contrary
notwithstanding, Payee shall not in any event be entitled to receive or collect,
nor shall or may amounts received hereunder be credited, so that Payee shall be
paid, as interest, a sum greater than the maximum rate of interest permitted by
applicable law. If any construction of this Note, or any and all other papers,
agreements or commitments, indicates a different right given to Payee to ask
for, demand or receive any larger sum as interest, such is a mistake in
calculation or wording, which this clause shall override and control; it being
the intention of the parties that this Note and all other instruments relating
to this Note shall in all things comply with applicable law, and proper
adjustment shall automatically be made accordingly. In the event Payee ever
receives, collects or applies as interest, any sum in excess of the maximum rate
of interest permitted by applicable law, such excess amount shall be applied to
the reduction of the unpaid principal balance of this Note in the inverse order
of maturity, and if this Note is paid in full, any remaining excess shall be
paid to Maker. In determining whether or not the interest paid or payable, under
any specific contingency, exceeds the maximum rate of interest permitted by
applicable law, Maker and Payee shall, the maximum extent permitted under
applicable law (i) characterize any nonprincipal payment as an expense, fee or
premium rather than as interest, (ii) exclude voluntary prepayments and the
effects thereof, and (iii) "spread" the total amount of interest throughout the
entire term of this Note so that the interest rate is uniform throughout the
entire term hereof.

         11. Attorneys' Fees and Costs. In the event an Event of Default shall
occur, and in the event that thereafter this Note is placed in the hands of an
attorney for collection, or in the event this Note is collected in whole or in
part through legal proceedings of any nature, then and in any such case Maker
promises to pay all costs of collection, including, but not limited to,
reasonable attorneys' fees incurred by the holder hereof on account of such
collection, whether or not suit is filed.

         12. Headings. The headings of the sections of this Note are inserted
for convenience only and shall not be deemed to constitute a part hereof.

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         EXECUTED as of the day and year first above written.

                                      /s/ JEFFREY S. DOSS
                                   --------------------------------
                                   Jeffrey S. Doss

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