Document:

Exhibit 4.1

                        SPECIMEN COMMON STOCK CERTIFICATE

NUMBER                                                                    SHARES
------

                   VECTOR INTERSECT SECURITY ACQUISITION CORP.

              INCORPORATED UNDER THE LAWS OF THE STATE OF DELAWARE

                                  COMMON STOCK

                                                                 SEE REVERSE FOR
                                                             CERTAIN DEFINITIONS

THIS CERTIFIES THAT                                          CUSIP

IS THE OWNER OF

            FULLY PAID AND NON-ASSESSABLE SHARES OF THE PAR VALUE OF
                        $.001 EACH OF THE COMMON STOCK OF

                   VECTOR INTERSECT SECURITY ACQUISITION CORP.

  transferable on the books of the Corporation in person or by duly authorized
       attorney upon surrender of this certificate properly endorsed. This
          certificate is not valid unless countersigned by the Transfer
           Agent and registered by the Registrar. Witness the seal of
                 the Corporation and the facsimile signatures of
                          its duly authorized officers.

      Dated:

____________________________________      ______________________________________
Chief Executive Officer                   Secretary

                   VECTOR INTERSECT SECURITY ACQUISITION CORP.
                                    CORPORATE
                                      SEAL

      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:

      TEN COM - as tenants in common

      TEN ENT - as tenants by the entireties

      JT TEN - as joint tenants with right of survivorship
               and not as tenants in common

UNIF GIFT MIN ACT -  __________    Custodian _____________
                       (Cust)                   (Minor)
                     under Uniform Gifts to Minors
                     Act _________________________________
                                      (State)

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

                   VECTOR INTERSECT SECURITY ACQUISITION CORP.

      The Corporation will furnish without charge to each stockholder who so
requests the powers, designations, preferences and relative, participating,
optional or other special rights of each class of stock or series thereof of the
Corporation and the qualifications, limitations, or restrictions of such
preferences and/or rights. This certificate and the shares represented thereby
are issued and shall be held subject to all the provisions of the Corporation's
Amended and Restated Certificate of Incorporation and all amendments thereto
(the "Certificate of Incorporation"), and resolutions of the Corporation's Board
of Directors providing for the issue of shares of Preferred Stock (copies of
which may be obtained from the Secretary of the Corporation), to all of which
the holder of this certificate by acceptance hereof assents.

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

    PLEASE INSERT SOCIAL SECURITY OR
                 OTHER
     IDENTIFYING NUMBER OF ASSIGNEE

_______________________________________

_______________________________________

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

________________________________________________________________________________

________________________________________________________________________________

_________________________________________________________________________ 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 will
full power of substitution in the premises.

Dated ___________________________        _______________________________________

                                        2

                                         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.

Signature(s) Guaranteed:

________________________________________________________________________________

THE SIGNATURE(S) SHOULD BE GUARANTEED BY AN ELIGIBLE GUARANTOR INSTITUTION
(BANKS, STOCKBROKERS, SAVINGS AND LOAN ASSOCIATIONS AND CREDIT UNIONS WITH
MEMBERSHIP IN AN APPROVED SIGNATURE GUARANTEE MEDALLION PROGRAM, PURSUANT TO
S.E.C. RULE 17Ad-15).

THE SHARES OF COMMON STOCK REPRESENTED BY THIS CERTIFICATE WERE INITIALLY ISSUED
AS PART OF AN ISSUANCE OF UNITS, EACH OF WHICH CONSISTS OF ONE SHARE OF COMMON
STOCK, PAR VALUE $.001 ("COMMON STOCK") OF VECTOR INTERSECT SECURITY ACQUISITION
CORP. (THE "CORPORATION") AND ONE COMMON STOCK PURCHASE WARRANT. THE SHARES OF
COMMON STOCK REPRESENTED BY THIS CERTIFICATE WILL NOT BE SEPARATELY TRANSFERABLE
UNTIL THE 20TH TRADING DAY FOLLOWING THE EARLIER TO OCCUR OF THE EXPIRATION OF
THE UNDERWRITERS' OVER-ALLOTMENT OPTION OR THE EXERCISE IN FULL BY THE
UNDERWRITERS OF THE OVER-ALLOTMENT OPTION UNLESS RODMAN & RENSHAW LLC INFORMS
THE CORPORATION OF ITS DETERMINATION THAT AN EARLIER SEPARATE TRADING DATE IS
ACCEPTABLE AND THE CORPORATION HAS MADE CERTAIN PUBLIC FILINGS WITH THE
SECURITIES AND EXCHANGE COMMISSION ON OR PRIOR TO SUCH EARLIER SEPARATE TRADING
DATE.

SUBJECT TO THE TERMS AND CONDITIONS SET FORTH IN THE CERTIFICATE OF
INCORPORATION THE HOLDER OF THIS CERTIFICATE SHALL BE ENTITLED TO RECEIVE FUNDS
FROM THE TRUST ACCOUNT (AS DEFINED IN THE CERTIFICATE OF INCORPORATION) ONLY IN
THE EVENT OF THE CORPORATION'S LIQUIDATION OR IF THE HOLDER SEEKS TO CONVERT THE
SHARES OF COMMON STOCK OWNED BY SUCH HOLDER INTO CASH UPON THE CONSUMMATION BY
THE CORPORATION OF A BUSINESS COMBINATION (AS DEFINED IN THE CERTIFICATE OF
INCORPORATION) WHICH SUCH HOLDER VOTED AGAINST AND WHICH IS ACTUALLY COMPLETED
BY THE CORPORATION. IN NO OTHER CIRCUMSTANCES SHALL THE HOLDER OF THIS
CERTIFICATE HAVE ANY RIGHT OR INTEREST OF ANY KIND IN OR TO THE TRUST ACCOUNT.

                                        3Exhibit 4.2

                    SPECIMEN PUBLIC OFFERING UNIT CERTIFICATE

     NUMBER                                                              UNITS
U-__________________

     SEE REVERSE FOR
         CERTAIN
       DEFINITIONS

                   VECTOR INTERSECT SECURITY ACQUISITION CORP.

                                                                   CUSIP

          UNITS CONSISTING OF ONE SHARE OF COMMON STOCK AND ONE WARRANT
                   EACH TO PURCHASE ONE SHARE OF COMMON STOCK
------------------------------- ------------------------------------------------

THIS CERTIFIES THAT
------------------------------- ------------------------------------------------
is the owner of                                                          Units.
-------------------- -------------------------------------------------- --------

Each Unit ("Unit") consists of one (1) share of common stock, par value $.001
per share ("Common Stock"), of VECTOR INTERSECT SECURITY ACQUISITION CORP., a
Delaware corporation (the "Company"), and one warrant (the "Warrant"). Each
Warrant entitles the holder to purchase one (1) share of Common Stock for $5.00
per share (subject to adjustment). Each Warrant will become exercisable on the
later of (i) the Company's completion of a Business Combination (as defined in
the Company's Amended and Restated Certificate of Incorporation (the
"Certificate of Incorporation")) with a Target Business (as defined in the
Certificate of Incorporation) or (ii) ______________, 2007 and will expire
unless exercised before 5:00 p.m., New York City Time, on ____________, 2011, or
earlier upon redemption (the "Expiration Date"). The shares of Common Stock and
Warrants comprising the Units represented by this certificate will trade
separately on the 20th trading day following the earlier to occur of the
expiration of the underwriter's over-allotment option or its exercise in full
unless the representative of the underwriters informs the Company of its
determination that an earlier separate trading date in acceptable; provided,
however, in no event will the representative of the underwriters allow separate
trading of the Common stock and Warrants until the Company files with the
Securities and Exchange Commission, an audited balance sheet reflecting the
Company's receipt of the gross proceeds of the offering of the Units. The terms
of the Warrants are governed by a Warrant Agreement, dated as of _______, 2005,
between the Company and American Stock Transfer & Trust Company, as Warrant
Agent, and are subject to the terms and provisions contained therein, all of
which terms and provisions the holder of this certificate consents to by
acceptance hereof. Copies of the Warrant Agreement are on file at the office of
the Warrant Agent at 59 Maiden Lane, New York, New York 10038, and are available
to any Warrant holder on written request and without cost. This certificate is
not valid unless countersigned by the Transfer Agent and Registrar of the
Company.

Witness the facsimile seal of the Company and the facsimile signature of its
duly authorized officers.
------- ------------------------------------- ----------------------------------

By
------- ------------------------------------- ----------------------------------

------- ------------------------------------- ----------------------------------
              Chief Executive Officer           Secretary
------- ------------------------------------- ----------------------------------

                   VECTOR INTERSECT SECURITY ACQUISITION CORP.

                                    CORPORATE
                                      SEAL

                   VECTOR INTERSECT SECURITY ACQUISITION CORP.

         The Company 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 of each class of stock or series
thereof of the Company 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:

         TEN COM  -  as tenants in common
         TEN ENT  -  as tenants by the entireties
         JT TEN  -   as joint tenants with right of survivorship
                     and not as tenants in common
------------------------ --------- ------------ --------------------------------

UNIF GIFT MIN ACT -                Custodian
------------------------ --------- ------------ --------------------------------
                          (Cust)                (Minor)
------------------------ --------- ------------ --------------------------------
                         under Uniform Gifts to Minors
------------------------ -------------------------------------------------------
                         Act
------------------------ ------ ------------------------------------------------
                                          (State)
------------------------ ------ ------------------------------------------------

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
------------------------------------------ -------------------------------------

------------------------------------------ -------------------------------------

------------------------------------------ -------------------------------------

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

--------------------------------------------------------------------------------

--------------------------------------------------------------------------------

                                                                        Units
---------------------------------------------------------------------
represented by the within Certificate, and do hereby irrevocably constitute and
appoint
                                                                       Attorney
---------------------------------------------------------------------
to transfer the said Units on the books of the within named Company will 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.

                                       2

Signature(s) Guaranteed:

--------------------------------------------------------------------------------
THE SIGNATURE(S) SHOULD BE GUARANTEED BY AN ELIGIBLE GUARANTOR INSTITUTION
(BANKS, STOCKBROKERS, SAVINGS AND LOAN ASSOCIATIONS AND CREDIT UNIONS WITH
MEMBERSHIP IN AN APPROVED SIGNATURE GUARANTEE MEDALLION PROGRAM, PURSUANT TO
S.E.C. RULE 17Ad-15).

                                       3

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