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                                                                     EXHIBIT 4.7

                             XENONICS HOLDINGS, INC.
                               WARRANT CERTIFICATE

            THIS WARRANT CERTIFICATE (the "Warrant Certificate") certifies that
      for value received, NEIL G. BERKMAN ASSOCIATES (the "Holder"), is the
      owner of this warrant (the "Warrant"), which entitles the Holder thereof
      to purchase at any time on or before the Expiration Date (as defined
      below) TWENTY FIVE THOUSAND (25,000.00) Shares (the "Warrant Shares") of
      fully paid non-assessable shares of the common stock, par value $.001 per
      share, (the "Common Stock"), of XENONICS HOLDINGS, INC. a Nevada
      corporation (the "Company"), at a purchase price of $ 5.05 per Warrant
      Share (the "Purchase Price"), in lawful money of the United States of
      America by bank or certified check, subject to adjustment as hereinafter
      provided.

                  THE WARRANT REPRESENTED BY THIS CERTIFICATE HAS NOT BEEN
            REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE "ACT"),
            AND IS SUBJECT TO RESTRICTIONS ON TRANSFERABILITY AS SET FORTH IN
            THIS CERTIFICATE. THIS WARRANT MAY NOT BE SOLD, TRANSFERRED, OR
            OTHERWISE DISPOSED OF IN THE ABSENCE OF AN EFFECTIVE REGISTRATION
            STATEMENT UNDER THE ACT OR AN OPINION OF COUNSEL, REASONABLY
            ACCEPTABLE TO COUNSEL FOR THE COMPANY, TO THE EFFECT THAT THE
            PROPOSED SALE, TRANSFER, OR DISPOSITION MAY BE EFFECTUATED WITHOUT
            REGISTRATION UNDER THE ACT.

            1.    WARRANT: PURCHASE PRICE.

            This Warrant shall entitle the Holder thereof to purchase the
Warrant Shares at the Purchase Price. The Purchase Price and the number of
Warrant Shares evidenced by this Warrant Certificate are subject to adjustment
as provided in Article 6.

            2.    EXERCISE: EXPIRATION DATE.

                  (a) This Warrant is exercisable, at the option of the Holder,
            at any time after the date of issuance and on or before the
            Expiration Date (as defined below) by delivering to the Company
            written notice of exercise (the "Exercise Notice"), stating the
            number of Warrant Shares to be purchased thereby, accompanied by
            bank or certified check payable to the order of the Company for the
            Warrant Shares to be purchased. Within twenty (20) business days of
            the Company's receipt of the Exercise Notice accompanied by the
            consideration for the Warrant Shares being purchased, the Company
            shall issue and deliver to the Holder a certificate representing the
            Warrant Shares being purchased. In the case of exercise for less
            than all of the Warrant Shares represented by this Warrant
            Certificate, the Company shall cancel this Warrant Certificate upon
            the surrender thereof and shall execute and deliver a new Warrant
            Certificate for the balance of such Warrant Shares.

                  (b) Expiration. The term "Expiration Date" shall mean 5:00
            p.m., New York time, on JUNE 30, 2009, or if such date shall in the
            State of New York shall be a holiday or a day on which banks are
            authorized to close, then 5:00 p.m., New York time, the next
            following day which in the State of New York is not a holiday or a
            day on which banks are authorized to close.

            3.    RESTRICTIONS ON TRANSFER.

                  (b) Restrictions. This warrant, and the Warrant Shares or any
            other security issuable upon exercise of this Warrant may not be
            assigned, transferred, sold, or otherwise

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            deposed of unless (i) there is in effect a registration statement
            under the Act covering such sale, transfer, or other disposition or
            (ii) the Holder furnishes to the Company an opinion of counsel,
            reasonably acceptable to counsel for the Company, to the effect that
            the proposed sale, transfer, or other disposition may be effected
            without registration under the Act, as well as such other
            documentation incident to such sale, transfer, or other disposition
            as the Company's counsel shall reasonably request.

                  (b) Legend. Any Warrant Shares issued upon the exercise of
            this Warrant shall bear the following legend:

                  "The shares evidenced by this certificate were issued upon
                  exercise of a Warrant and may not be sold, transferred, or
                  otherwise disposed of in the absence of an effective
                  registration under the Securities Act of 1933 (the "Act") or
                  an opinion of counsel, reasonably acceptable to counsel for
                  the Company, to the effect that the proposed sale, transfer,
                  or disposition may be effectuated without registration under
                  the Act."

            4.    RESERVATION OF SHARES.

            The Company covenants that it will at all times reserve and keep
available out of its authorized Common Stock, solely for the purpose of issuance
upon exercise of this Warrant, such number of shares of Common Stock as shall
then be issuable upon the exercise of this Warrant. The company covenants that
all shares of Common Stock which shall be issuable upon exercise of this Warrant
shall be duly and validly issued and fully paid and non-assessable and free from
all taxes, liens, and charges with respect to the issue thereof.

            5.    LOSS OR MUTILATION.

            Upon receipt by the Company of reasonable evidence of the loss,
theft, destruction, or mutilation of this Warrant Certificate and, in the case
of loss, theft, or destruction, of indemnity reasonably satisfactory to the
Company, or in the case of mutilation, upon surrender and cancellation of the
mutilated Warrant Certificate, the Company shall execute and deliver in lieu
thereof, a new Warrant Certificate representing an equal number of Warrant
Shares exercisable thereunder.

            6.    ANTI-DILUTION PROVISIONS.

                  (a) The number of shares of Common Stock and the Purchase
            Price per Warrant Share pursuant to this Warrant shall be subject to
            adjustment from time to time as provided for in this Section 6(a).
            Notwithstanding any provision contained herein, the aggregate
            Purchase Price for the total number of Warrant Shares issuable
            pursuant to this Warrant shall remain unchanged. In case the Company
            shall at any time change as a whole, by subdivision or combination
            in any manner or by the making of a stock dividend, the number of
            outstanding shares of Common Stock into a different number of
            shares, (i) the number of shares which the Holder of this Warrant
            shall have been entitled to purchase pursuant to this Warrant shall
            be increased or decreased in direct proportion to such increase or
            decrease of shares, as the case may be, and (ii) the Purchase Price
            per Warrant Share (but not he aggregate Purchase Price) in effect
            immediately prior to such change shall be increased or decreased in
            inverse proportion to such increase or decrease of shares, as the
            case may be.

                  (b) In case of any capital reorganization or any
            reclassification of the capital stock of the Company or in case of
            the consolidation or merger of the Company with another corporation
            (or in the case of any sale, transfer, or other disposition to
            another corporation of all or substantially all the property,
            assets, business, and goodwill of the Company), the Holder of

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            this Warrant shall thereinafter be entitled to purchase the kind and
            amount of shares of capital stock which this Warrant entitled the
            Holder to purchase immediately prior to such capital reorganization,
            reclassification of capital stock, consolidation, merger, sale,
            transfer, or other disposition; and in any such case appropriate
            adjustments, shall be made in the application of the provisions of
            this Section 6 with respect to rights and interests thereafter of
            the Holder of this Warrant to the end that the provisions of this
            Section 6 shall thereafter be applicable, as near as reasonably may
            be, in relation to any shares or other property thereafter
            purchasable upon the exercise of this Warrant.

                  (c) Fractional Shares. No certificate for fractional shares
            shall be issued upon the exercise of this Warrant, but in lieu
            thereof the Company shall purchase any such fractional shares
            calculated to the nearest cent.

                  (d) Rights to the Holder. The Holder of this Warrant shall not
            be entitled to any rights of a shareholder of the Company in respect
            to any Warrant Shares purchasable upon the exercise hereof until
            such Warrant Shares have been paid for in full and issued to it. As
            soon as practicable after such exercise, the Company shall deliver a
            certificate or certificates for the number of full shares of Common
            Stock issuable upon such exercise, to the person or persons entitled
            to receive the same.

            7.    REPRESENTATIONS AND WARRANTIES.

            The Holder, by acceptance of this Warrant, represents and warrants
to, and covenants and agrees with, the Company as follows:

                        (i) The Warrant is being acquired for the Holder's own
                  account for investment an not with a view toward resale or
                  distribution of any part thereof, and the Holder has no
                  present intention of selling, granting any participation in,
                  or otherwise distributing the same.

                        (ii) The Holder is aware that the Warrant is not
                  registered under the Act or any state securities or blue sky
                  laws and, as a result, substantial restrictions exist with
                  respect to the transferability of the Warrant and the Warrant
                  Shares to be acquired upon exercise of this Warrant.

                        (iii) The Holder is an accredited investor as defined in
                  Rule 501(a) of Regulation D under the Act and is a
                  sophisticated investor familiar with the type of risks
                  inherent in the acquisition of securities such as the Warrant,
                  and its financial position is such that it can afford to
                  retain the Warrant and the Warrant Shares for an indefinite
                  period of time without realizing any direct or indirect cash
                  return on this investment.

            8.    REGISTRATION.

                  (a) Piggyback Registration. The Company agrees that if other
            than a registration statement filed to register the distribution of
            warrants and/or to register shares for selling shareholders to be
            prepared and filed within one year of the date hereof, at any time
            on or before the Expiration Date the Company registers any of its
            securities under the Act, whether for its own account or on behalf
            of selling stockholders the Company will provide the Holder with at
            least forty-five (45) days prior written notice of such intention
            and, upon request from the Holder, will cause the underlying shares
            issuable under this Warrant designated by the Holder to be
            registered under the Act (such event, a "Piggyback Registration").

                  (b) Piggyback Registration Procedures. A registration
            statement referred to in Section

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            8(a) shall be prepared and processed in accordance with the
            following terms and conditions:

                        (i) The Holder agrees to cooperate in furnishing
                  promptly to the Company in writing any information requested
                  by the Company in connection with the preparation, filing, and
                  processing of such registration statement.

                        (ii) The Company shall include in the registration
                  statement the shares of Common Stock proposed to be included
                  in the Piggyback Registration, subject to the limitations set
                  forth in Section 8(c).

                        (iii) The Company shall prepare and file with the
                  Securities and Exchange Commission (the "SEC") such amendments
                  and supplements to such registration statement and the
                  prospectuses used in connections therewith as may be required
                  to comply with the provisions of the Act.

                        (iv) The Company shall furnish to the Holder such number
                  of copies of each prospectus, including preliminary
                  prospectuses, in conformity with the requirements of the Act,
                  and such other documents, as the Holder may reasonably request
                  in order to facilitate the public sale or other disposition of
                  the shares owned by it.

                        (v) The Company shall provide a transfer agent and
                  registrar for all such Common Stock registered pursuant to
                  this Section 8 not later than the Effective Date of such
                  registration statement.

                        (vi) The Company shall, in connection with an
                  underwritten offering, enter into an underwriting agreement on
                  terms customarily contained in underwriting agreements with
                  respect to secondary distributions or combined primary and
                  secondary distributions, as appropriate.

                        (vii) The Company shall make available for inspection
                  upon reasonable terms by the Holder, any underwriter
                  participating in any disposition pursuant to such registration
                  statement, and any attorney, accountant, or other agent
                  retained by an such Holder or underwriter, all financial and
                  other records, pertinent corporate documents and properties of
                  the Company, and cause the Company's officers, directors and
                  employees to supply all information reasonably requested by
                  any such Holder, underwriter, attorney, accountant or agent in
                  connection with the preparation of such registration
                  statement, provided that as a condition precedent to such
                  inspection, the Company may require such inspecting party to
                  execute and deliver a confidentiality agreement in a form to
                  be provided by the Company.

                        (viii) The Holder shall not (until further notice)
                  effect sales of the shares covered by the registration
                  statement after receipt of telegraphic or written notice from
                  the Company to suspend sales to permit the Company to correct
                  or update registration statement or prospectus.

                  (c) Limitations. Notwithstanding the foregoing, if a Piggyback
            Registration is an underwritten offering and the managing
            underwriter advises the Company in writing that in its opinion the
            total amount of securities requested to be included in such
            registration exceeds the amount of securities which can be sold in
            such offering, the Company will include in such registration: (i)
            first, all securities the Company proposes to sell, and (ii) second,
            up to such amount of securities requested to be included in such
            registration by the Holders of the Company, which in the opinion of
            such managing underwriter can be sold.

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            9.    FURNISH INFORMATION.

            The Company agrees that is shall promptly deliver to the Holder
copies of all financial statements, reports and proxy statements which the
Company is required to send to its shareholders generally.

            10.   INDEMNIFICATION.

                  (a) The Company may require, as a condition to including any
            Common Stock in any Piggyback Registration pursuant to Section 8
            hereof that the Company shall have received an undertaking
            satisfactory to it from the Holder to indemnify and hold harmless
            the Company, each director of the Company, each officer of the
            Company who shall sign such registration statement, each person who
            participates as an underwriter (if such underwriter so requests) in
            the offering or sale of such securities and each person, if any, who
            controls such underwriter within the meaning of Section 15 of the
            Act or Section 20 of the Exchange Act (each, an "Indemnified
            Person"), against any losses, claims damages, liabilities or
            expenses, joint or several, to which such person may become subject
            under the Act or otherwise, insofar as such losses, claims, damages,
            liabilities or expenses (or actions or proceedings in respect
            thereof) arise out of or are based upon (i) any untrue statement or
            alleged untrue statement of any material fact contained in any
            registration statement under which such securities were registered
            under the Act, any preliminary prospectus, final prospectus or
            summary prospectus contained therein, or any amendment thereof or
            supplement thereto, or any document incorporated by reference
            therein, or (ii) omission or alleged omission to state therein a
            material fact required to be stated therein or necessary to make the
            statements therein not misleading, if such actual or alleged
            statement or omission described in (i) or (ii) above was made in
            reliance upon and in conformity with written information furnished
            to the Company by such Holder for use in the preparation of such
            registration statement, preliminary prospectus, final prospectus,
            summary prospectus, amendment or supplement. Such indemnity shall
            remain in full force and effect regardless of any investigation made
            by or on behalf of the Company or any such director, officer,
            participating person or controlling person and shall survive the
            transfer of such securities by such Holder.

                  (b) The Company shall agree, in connection with any
            registration statement filed pursuant to Section 8 hereof, that the
            Company shall indemnify each Holder selling Common Stock pursuant to
            such registration statement and each other person, if any, who
            controls such Holder within meaning of Section 15 of the Act or
            Section 20 of the Exchange Act, against any losses, claims, damages,
            liabilities or expenses, joint or several, to which such person may
            become subject under the Act or otherwise, insofar as such losses,
            claims, damages, liabilities or expenses (or actions or proceedings
            in respect thereof) arise out of or are based upon (i) any untrue
            statement or alleged untrue statement of any material fact contained
            in any registration statement under which such securities were
            registered under the Act, any preliminary prospectus, final
            prospectus or summary prospectus contained therein, or any amendment
            thereof or supplement thereto or any document incorporated by
            referenced therein, or (ii) any omission or alleged omission to
            state therein a material fact required to be stated therein or
            necessary to make the statements therein not misleading, provided
            that the Company shall not be liable in any such case to the extent
            that any such loss, claim, damage, liability or expense arises out
            of or is based upon an untrue statement or alleged untrue statement
            or omission or alleged omission made in reliance upon and in
            conformity with written information furnished to the Company by the
            Holder for use in preparation of such registration statement,
            preliminary prospectus, final prospectus, summary prospectus,
            amendment or supplement.

                  (c) If the Indemnification provided for in Sections 10(a) or
            10(b) above is unavailable to

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            an indemnified party in respect of any losses, claims, damages or
            liabilities referred to therein, then each indemnifying party in
            lieu of indemnifying such indemnified party thereunder shall
            contribute to the amount paid or payable by such indemnified party
            as a result of such losses, claims, damages or liabilities, in such
            proportion as is appropriate to reflect the relative fault of the
            indemnifying party on the one hand and of the indemnified parties on
            the other in connection with the statements or omissions which
            resulted in such losses, claims, damages or liabilities, as well as
            any other relevant equitable considerations. The relative fault of
            the indemnifying party and of the indemnified parties shall be
            determined by reference to, among other things, whether the untrue
            or alleged untrue statement of a material fact or the omission to
            state a material fact relates to information supplied by the
            indemnifying party, or by the indemnified parties, and the parties'
            relative intent, knowledge, access to information and opportunity to
            correct or prevent such statement or omission.

            The Company and the Holder agree that it would not be just and
equitable if contribution pursuant to this Section 10(c) were determined by pro
rata allocation or by any other method of allocation which does not take into
account the equitable considerations referred to in the immediately preceding
paragraph. The amount paid or payable by an indemnified party as a result of the
losses, claims, damages and liabilities or actions in respect thereof referred
to in the immediately preceding paragraph shall be deemed to include, subject to
the limitations set forth above, any legal or other expenses reasonably incurred
by such indemnified party in connection with investigating or defending any such
action or claim. No person guilty of fraudulent misrepresentation (within the
meaning of Section 11(f) of the Securities Act) shall be entitled to
contribution from any person who was not guilty of such fraudulent
misrepresentation.

            11.   MISCELLANEOUS.

                  (a) Transfer Taxes: Expenses. The Holder shall pay any and all
            underwriters' discounts, brokerage fees, and transfer taxes incident
            to the sale or exercise of this Warrant or the sale of the
            underlying shares issuable thereunder, and shall pay the fees and
            expenses of any special attorneys or accountants retained by it.

                  (b) Notice. Any notice or other communication required or
            permitted to be given to the Company shall be in writing and shall
            be delivered by certified mail with return receipt or delivered in
            person against receipt, as follows:

                             Xenonics Holdings, Inc.
                             2236 Rutherford Road, Suite 123
                             Carlsbad, CA 92008

                  (c) Governing Law. This Warrant Certificate shall be governed
            by, and construed in accordance with, the laws of the State of
            Nevada, without reference to the conflicts of laws.

            IN WITNESS WHEREOF, the company has caused this Warrant Certificate
to be duly executed as of the date set forth below.

                                                        XENONICS HOLDINGS, INC,

                                                        By:
                                                            --------------------

Date: July 1, 2004

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                           FORM OF EXERCISE OF WARRANT

      The undersigned hereby elects to exercise this Warrant as to _______Common
Shares covered thereby. Enclosed herewith is a bank or certified check in the
amount of $_____.

Date:__________________

                                           Name:________________________________

                                           Address:_____________________________
                                           _____________________________________
                                           _____________________________________

                                           Signature:___________________________

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                                                                   EXHIBIT 10.11

                        1ST AMENDMENT TO LEASE AGREEMENT

      This 1st Amendment to Lease is dated July 21, 2004, by and between Bay
      West Equities Carlsbad Research Center, LLC ("Landlord") and Xenonics,
      Inc., a California Corporation ("Tenant"), with reference to the following
      facts:

                                    RECITALS

      A.    Landlord and Tenant are parties to a lease dated August 16, 2000,
            including Addendum I of the same date ("Lease"), for the leasing of
            certain premises consisting of approximately 9,179 square feet area
            within a larger multi-tenant R&D/industrial project located at 2236
            Rutherford Road, #121/123, Carlsbad, California, 92008. Landlord and
            Tenant hereby express their mutual desire and intent to amend by
            this writing the terms and conditions of the Lease as hereinafter
            provided.

      B.    The Tenant desires to extend its lease by four (4) years to an
            expiration date of October 31st, 2008 (the "Extended Term").

      NOW THEREFORE, the parties hereto agree as follows, effective July 22,
2004:

            1. RENT ADJUSTMENT: The Basic Rent for the Extended Term shall be
               adjusted as follows:

               November 1, 2004 -- October 31, 2005: $8,261.10 per month
               ($0.90 psf)
               November 1, 2005 -- October 31, 2006: $8,720.05 per month
               ($0.95 psf)
               Thereafter rent to increase at three percent (3%) per annum:
               November 1, 2006 -- October 31, 2007: $8,981.65 per month ($0.978
               psf) November 1, 2007 -- October 31, 2008: $9,251.10 per month
               ($1.01 psf)

            2. LEASE TYPE: Triple Net.

            3. CURRENT COMMON AREA CHARGES: $2,517.12 per month (2004 calendar
               year CAM estimate)

            4. TENANT IMPROVEMENT ALLOWANCE: Up to $2 per square foot.

            5. LEASE EXTENSION START DATE: November 1, 2004.

            6. LEASE EXTENSION TERM: Four (4) years.

IN WITNESS WHEREOF, the parties have executed this Amendment as of the date and
year first above written.

LANDLORD:                                         TENANT:
BAY WEST EQUITIES CARLSBAD RESEARCH               XENONICS, INC.
CENTER, LLC

By: /s/ Patrick Sammons                           By: __________________________
    --------------------------
          Patrick Sammons

Title: Managing Member                            Printed: _____________________

Date: July 22, 2004                               Title: _______________________

                                                  Date: ________________________

Xenonics 1st Amendment to Lease 7-22-04

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