Document:

<PAGE>
                                                                     EXHIBIT 4.1
<TABLE>
<CAPTION>
<S>                                                                        <C>
NUMBER                                                                           SHARES
                                                                              COMMON STOCK

                   UNITY EMERGING TECHNOLOGY VENTURE ONE LTD.

              INCORPORATED UNDER THE LAWS OF THE STATE OF DELAWARE
                                                                                  CUSIP

This                                                                       SEE REVERSE FOR
certifies                                                                CERTAIN DEFINITIONS
that
</TABLE>

is the owner of

 FULLY PAID AND NON-ASSESSABLE SHARES OF THE COMMON STOCK, PAR VALUE $.0001 PER
                                    SHARE, OF

                   UNITY EMERGING TECHNOLOGY VENTURE ONE LTD.

CERTIFICATE OF STOCK

(hereinafter called the "Corporation"), transferable upon the books of the
Corporation by the holder hereof in person or by duly authorized attorney upon
surrender of this certificate properly endorsed. This certificate and the shares
represented hereby are issued under and shall be subject to all the provisions
of the Certificate of Incorporation and By-Laws of the Corporation (copies of
which are on file at the office of the Transfer Agent of the Corporation), to
all of which the holder by acceptance hereof assents.

        This certificate is not valid unless countersigned by the Transfer
Agent.

        Witness the facsimile seal of the Corporation and the facsimile
signatures of its duly authorized officers.

        Dated:
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<CAPTION>
<S>                                                  <C>                  <C>
COUNTERSIGNED:                                       By:                  By:
 AMERICAN STOCK TRANSFER & TRUST COMPANY,
                                   as Warrant Agent    /s/Norman Leben    /s/Lawrence Burstein

                                 Authorized Officer            SECRETARY             PRESIDENT
</TABLE>

                   UNITY EMERGING TECHNOLOGY VENTURE ONE LTD.
                                    CORPORATE
                                      SEAL
                                      2000
                                    DELAWARE
                                        *

<PAGE>

                   UNITY EMERGING TECHNOLOGY VENTURE ONE LTD.

        The Corporation will furnish without charge to each stockholder who so
requests, a statement of the powers, designations, preferences and relative,
participating, optional, or other special rights or each class of stock or
series thereof and the qualifications, limitations or restrictions of such
preferences and/or rights.

        The following abbreviations, when used in the inscription on the face of
this certificate, shall be construed as though they were written out in full
according to applicable laws or regulations:

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<S>                                          <C>
TEN COM - as tenants in common               UNIF GIFT MIN ACT - _________ Custodian _________
TEN ENT - as tenants by the entireties                             (Cust)             (Minor)
JT TEN - as joint tenants with right of                        under Uniform Gifts to Minors
         survivorship and not as tenants                       Act______________
         in common                                                   (State)

</TABLE>

     Additional abbreviations may also be used though not in the above list.

  For value received, ___________________ hereby sell, assign and transfer unto

        PLEASE INSERT SOCIAL SECURITY OR OTHER
           IDENTIFYING NUMBER OF ASSIGNEE

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  (PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS, INCLUDING ZIP CODE, OF ASSIGNEE)

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__________________________________________________________________________shares
of the capital stock represented by the within Certificate; and do hereby
irrevocably constitute and appoint _____________________________________________
________________________________________________________________________Attorney

to transfer the said stock on the books of the within named Corporation with
full power of substitution in the premises.

Dated ____________________

      --------------------------------------------------------------------
      NOTICE: THE SIGNATURE TO THIS ASSIGNMENT MUST CORRESPOND WITH THE NAME AS
              WRITTEN UPON THE FACE OF THE CERTIFICATE IN EVERY PARTICULAR,
              WITHOUT ALTERATION OR ENLARGEMENT OR ANY CHANGE WHATEVER.<PAGE>
                                                                     EXHIBIT 4.2

NO. WA                         VOID AFTER      , 2006                  WARRANTS
                     CLASS A REDEEMABLE WARRANT CERTIFICATE

                   UNITY EMERGING TECHNOLOGY VENTURE ONE LTD.

THIS CERTIFIES THAT, FOR VALUE RECEIVED                                  CUSIP

or registered assigns (the "Registered Holder") is the owner of the number of
Class A Redeemable Warrants (the "Warrants") specified above. Each Warrant
initially entitles the Registered Holder to purchase, subject to the terms and
conditions set forth in this Certificate and the Warrant Agreement (as
hereinafter defined), one fully paid and nonassessable share of Common Stock,
$.0001 par value, of Unity Emerging Technology Venture One Ltd., a Delaware
corporation (the "Company"), and one-half of one Class B Redeemable Warrant of
the Company at any time from the Commencement Date (as hereinafter defined) to
the Expiration Date (as hereinafter defined) upon the presentation and surrender
of this Warrant Certificate with the Subscription Form on the reverse hereof
duly executed, at the corporate office of American Stock Transfer & Trust
Company, 40 Wall Street, New York, New York 10005, as Warrant Agent, or its
successor (the "Warrant Agent"), accompanied by payment of $5.00, subject to
adjustment (the "Purchase Price"), in lawful money of the United States of
America in cash or by check made payable to the Warrant Agent for the account of
the Company.

      This Warrant Certificate and each Warrant represented hereby are issued
pursuant to and are subject in all respects to the terms and conditions set
forth in the Warrant Agreement (the "Warrant Agreement"), dated as of , 2000, by
and between the Company and the Warrant Agent.

      In the event of certain contingencies provided for in the Warrant
Agreement, the Purchase Price and the number of shares of Common Stock and the
number of Class B Redeemable Warrants subject to purchase upon the exercise of
each Warrant represented hereby are subject to modification or adjustment.

      Each Warrant represented hereby is exercisable at the option of the
Registered Holder, but no fractional interests will be issued. In the case of
the exercise of less than all the Warrants represented hereby, the Company shall
cancel this Warrant Certificate upon the surrender hereof and shall execute and
deliver a new Warrant Certificate or Warrant Certificates of like tenor, which
the Warrant Agent shall countersign, for the balance of such Warrants.

      The term "Commencement Date" shall mean the later of (i) , 2001 or (ii)
the date of the consummation of a merger, exchange of capital stock, asset
acquisition or other similar business combination of the Company with an
operating business. The term "Expiration Date" shall mean 5:00 P.M. (New York
City time) on , 2006. If each such date shall in the State of New York be a
holiday or a day on which the banks are authorized to close, then such date
shall mean 5:00 P.M. (New York City 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.

      The Company shall not be obligated to deliver any securities pursuant to
the exercise of this Warrant unless a registration statement under the
Securities Act of 1933, as amended (the "Act"), with respect to such securities
is effective or an exemption thereunder is available. The Company has covenanted
and agreed that it will file a registration statement under the Federal
securities laws, use its best efforts to cause the same to become effective, to
keep such registration statement current, if required under the Act, while any
of the Warrants are outstanding, and deliver a prospectus which complies with
Section 10(a)(3) of the Act to the Registered Holder

<PAGE>

exercising this Warrant.

      This Warrant shall not be exercisable by a Registered Holder in any state
where such exercise would be unlawful.

      This Warrant Certificate is exchangeable, upon the surrender hereof by the
Registered Holder at the corporate office of the Warrant Agent, for a new
Warrant Certificate or Warrant Certificates of like tenor representing an equal
aggregate number of Warrants, each of such new Warrant Certificates to represent
such number of Warrants as shall be designated by such Registered Holder at the
time of such surrender. Upon due presentment and payment of any tax or other
charge imposed in connection therewith or incident thereto, for registration of
transfer of this Warrant Certificate at such office, a new Warrant Certificate
or Warrant Certificates representing an equal aggregate number of Warrants will
be issued to the transferee in exchange therefor, subject to the limitations
provided in the Warrant Agreement.

      Prior to the exercise of any Warrant represented hereby, the Registered
Holder shall not be entitled to any rights of a stockholder of the Company,
including, without limitation, the right to vote or to receive dividends or
other distributions, and shall not be entitled to receive any notice of any
proceedings of the Company, except as provided in the Warrant Agreement.

      Subject to the provisions of the Warrant Agreement, this Warrant may be
redeemed at the option of the Company and with the prior consent of Gaines,
Berland Inc., at a redemption price of $.05 per Warrant, at any time commencing
after the Commencement Date, provided that the last sales price of the Common
Stock shall have, for twenty (20) consecutive trading days ending on the third
day prior to the day that the notice of redemption is given, equaled or exceeded
$7.50 per share (subject to adjustment in the event of any stock splits or other
similar events). Notice of redemption shall be given not less than the thirtieth
day before the date fixed for redemption, all as provided in the Warrant
Agreement. On and after the date fixed for redemption, the Registered Holder
shall have no rights with respect to this Warrant except to receive the $.05 per
Warrant upon surrender of this Certificate.

      In accordance with the Warrant Agreement, Gaines, Berland Inc. and
EarlyBirdCapital, Inc., collectively, shall be entitled to receive a commission
equal to 5% of the proceeds received by the Company from the exercise of the
Warrants.

      Prior to due presentment for registration of transfer hereof, the Company
and the Warrant Agent may deem and treat the Registered Holder as the absolute
owner hereof and of each Warrant represented hereby (notwithstanding any
notations of ownership or writing hereon made by anyone other than a duly
authorized officer of the Company or the Warrant Agent) for all purposes and
shall not be affected by any notice to the contrary, except as provided in the
Warrant Agreement.

      This Warrant Certificate shall be governed by and construed in accordance
with the laws of the State of New York without giving effect to conflicts of
laws.

      This Warrant Certificate is not valid unless countersigned by the Warrant
Agent.

      IN WITNESS WHEREOF, the Company has caused this Warrant Certificate to be
duly executed, manually or in facsimile by two of its officers thereunto duly
authorized and a facsimile of its corporate seal to be imprinted hereon.

Dated:                              UNITY EMERGING TECHNOLOGY VENTURE ONE LTD.

<PAGE>

COUNTERSIGNED:                             By:               By:
 AMERICAN STOCK TRANSFER & TRUST COMPANY,
                         as Warrant Agent     /s/Norman Leben    /s/Lawrence
                                                                    Burstein

                        Authorized Officer         SECRETARY         PRESIDENT

                   UNITY EMERGING TECHNOLOGY VENTURE ONE LTD.
                                    CORPORATE
                                      SEAL
                                      2000
                                    DELAWARE
                                        *

<PAGE>

                                SUBSCRIPTION FORM

      To Be Executed by the Registered Holder in Order to Exercise Warrants

      The undersigned Registered Holder hereby irrevocably elects to exercise
_____________ Warrants represented by this Warrant Certificate, and to purchase
the securities issuable upon the exercise of such Warrants, and requests that
certificates for such securities shall be issued in name of

                          PLEASE INSERT SOCIAL SECURITY
                           OR OTHER IDENTIFYING NUMBER
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
                     (please print or type name and address)

and be delivered to
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
                   (please print or type name and address)

and if such number of Warrants shall not be all the Warrants evidenced by this
Warrant Certificate, that a new Warrant Certificate for the balance of such
Warrants be registered in the name of, and delivered to, the Registered Holder
at the address stated below.

Dated:_________________________________    X ___________________________________
                                             ___________________________________
                                             ___________________________________
                                             ___________________________________
                                                          Address

                                             ___________________________________
                                               Social Security or Taxpayer
                                                  Identification Number

                                             ___________________________________
                                                  Signature Guaranteed
                                             ___________________________________

      The undersigned represents that the exercise of the within Warrant was
solicited by Gaines, Berland Inc. and/or EarlyBirdCapital, Inc. If not
solicited by Gaines, Berland Inc. and/or EarlyBirdCapital, Inc., please write
"unsolicited" in the space below or write the name of the broker/dealer which
solicited your exercise. Unless otherwise indicated, it will be assumed that
the exercise was solicited by Gaines, Berland Inc. and/or EarlyBirdCapital,
Inc.
                                         -------------------------------------
                                         (Write "unsolicited" on above line if
                                         not solicited by Gaines, Berland Inc.
                                                and/or EarlyBirdCapital, Inc.)

Dated: _______________________________  Signature: _____________________________

<PAGE>

                                   ASSIGNMENT

      FOR VALUE RECEIVED,
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hereby sells, assigns and transfers unto

                        PLEASE INSERT SOCIAL SECURITY OR
                            OTHER IDENTIFYING NUMBER
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
                     (please print or type name and address)

___________________________ of the Warrants represented by this Warrant
Certificate, and hereby irrevocably constitutes and appoints ___________________
________________________________________________________________________________
Attorney to transfer this Warrant Certificate on the books of the Company, with
full power of substitution in the premises.

Dated:  _________________________________        X _____________________________
                                                      Signature Guaranteed

THE SIGNATURE TO THE ASSIGNMENT OR THE SUBSCRIPTION FORM MUST CORRESPOND TO THE
NAME AS WRITTEN UPON THE FACE OF THIS WARRANT CERTIFICATE IN EVERY PARTICULAR,
WITHOUT ALTERATION OR ENLARGEMENT OR ANY CHANGE WHATSOEVER AND MUST BE
GUARANTEED BY A COMMERCIAL BANK OR TRUST COMPANY OR A MEMBER FIRM OF THE
AMERICAN STOCK EXCHANGE, NEW YORK STOCK EXCHANGE, PACIFIC STOCK EXCHANGE OR
MIDWEST STOCK EXCHANGE.

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