Document:

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                                                                    Exhibit 10.8

      THE SECURITY REPRESENTED BY THIS INSTRUMENT HAS BEEN, AND THE SECURITIES
ISSUABLE UPON CONVERSION, IF ANY, OF THIS INSTRUMENT IN ACCORDANCE WITH ITS
TERMS SHALL BE, ACQUIRED FOR INVESTMENT AND NOT WITH A VIEW TO, OR IN CONNECTION
WITH, THE SALE OR DISTRIBUTION THEREOF. NO SUCH SALE OR DISPOSITION MAY BE
EFFECTED WITHOUT AN EFFECTIVE REGISTRATION STATEMENT RELATED THERETO OR AN
OPINION OF COUNSEL ACCEPTABLE TO THE COMPANY THAT SUCH REGISTRATION IS NOT
REQUIRED UNDER THE SECURITIES ACT OF 1933.

                  REAL TIME STRATEGIES, INC. d/b/a RTS WIRELESS

                   NON-NEGOTIABLE CONVERTIBLE PROMISSORY NOTE

January 24, 2000                                                      $3,500,000
Plainview, New York

      For value received, Real Time Strategies, Inc. d/b/a RTS Wireless, a New
York corporation (the "Company"), hereby promises to pay to Monsoon Ventures
LLC, a New York limited liability company ("Holder"), $3,500,000 at the times
and in the manner hereinafter provided.

      This Note shall bear interest at a per annum rate equal to eight percent
(8%) compounded annually, and, subject to the conversion provisions set forth
below, shall be payable in full on January 24, 2001.

      Upon any closing by the Company of an equity financing transaction (as
defined below) with a publicly traded strategic investor (such investor, the
"Strategic Investor" and such financing, the "Strategic Financing") in any
amount, after the date hereof but before the earlier of any Financing in which
this Note is converted into Securities (as such terms are defined below), Sale
Transaction (as defined below), Public Offering (as defined below) or January
24, 2001, the then outstanding principal amount hereof shall be automatically
and simultaneously converted into that number of shares of common stock of the
Company (the "Common Stock") determined by dividing such outstanding principal
amount by (a) if Common Stock is issued in the Strategic Financing, the price
per share at which such Common Stock is sold in such financing or (b) if
preferred stock or debentures that are convertible into Common Stock are issued
in such financing (a "Convertible Security"), the effective price per share of
Common Stock into which such Convertible Security is convertible; provided,
however, that notwithstanding the foregoing, such price per share of Common
Stock shall in no event be less than the price per share that is derived by
dividing $250,000,000 by the number of shares of Common Stock determined on a
fully diluted basis (as defined below) immediately before such Strategic
Financing. If reasonably practicable, the Company shall give Holder written
notice of the closing of any Strategic Financing at least three (3) days before
the occurrence thereof and, in all events, no later than the date of such
closing. Subject to the foregoing, if the Strategic Financing is effected
through multiple closings, Holder will be issued Common Stock at the average
price for all closings, to the extent the closings have different prices. Any
accrued and unpaid interest as of the date of any such conversion shall be paid
in cash. As used in this Note, (a) "fully diluted"
<PAGE>

means all of the issued and outstanding shares of Common Stock, together with
the number of shares of Common Stock subject to options and warrants issued
under any stock option plan of the Company or otherwise to the extent such
options are either vested at the time of such determination or will with the
passage of time become vested within six months thereafter and (b) "equity
financing transaction" means any transaction in which the Company issues Common
Stock, a Convertible Security or another equity security.

      Subject to the paragraph immediately following this paragraph, upon any
closing by the Company of a non-public equity financing transaction of at least
$6,000,000 with a party other than a Strategic Investor after the date hereof
but before the earlier of any Strategic Financing, Sale Transaction, Public
Offering or January 24, 2001 (a "Financing"), the then outstanding principal
amount hereof shall be automatically and simultaneously converted into that
number of shares of stock of the class and series issued in the Financing, or
such other equity securities convertible into shares of stock as may be issued
in the Financing (in either case, the "Securities") determined by dividing (a)
such outstanding principal amount by (b) the price per security at which such
Securities are sold in the Financing; provided, however, that notwithstanding
the foregoing, if the actual valuation of the Company upon which such Financing
is based is $400,000,000 or more (immediately prior to such financing, and based
on the number of shares of Common Stock determined on a fully diluted basis
immediately before such Financing), then conversion of this Note shall not be
automatic but shall be at the option of Holder. If reasonably practicable, the
Company shall give Holder written notice of the closing of any Financing at
least five (5) days before the occurrence thereof and, in all events, no later
than the date of such closing. Any optional conversion of this Note in
connection with a valuation of more than $400,000,000 in accordance with this
paragraph shall be subject to and conditional upon delivery by Holder to the
Company on or before the date of such closing or within thirty (30) days
thereafter of Holder's written election to convert this Note. Subject to the
foregoing, if the Financing is effected through multiple closings, Holder will
be issued Securities at the average price for all closings, to the extent the
closings have different prices. Any accrued and unpaid interest as of the date
of any such conversion shall be paid in cash.

      Recalculation Right. Notwithstanding the foregoing, in the event (x) a
Financing occurs before any Strategic Financing and, in connection with such
Financing, the outstanding principal amount hereof is converted into Securities
and (y) within sixty (60) days after the closing of such Financing a Strategic
Financing is closed that is based on a valuation of the Company that is lower
(the "Lower Valuation") than the valuation upon which such Financing was based,
then the number of Securities into which such principal amount is convertible
shall be re-calculated utilizing the greater of $250,000,000 or the Lower
Valuation. Within thirty (30) days after the closing of any such Strategic
Financing at a Lower Valuation, the Company shall (a) give notice thereof to
Holder, together with a statement in reasonable detail showing the Lower
Valuation and such re-calculation (based on $250,000,000 or such Lower
Valuation, as the case may be) and (b) issue to Holder such additional
Securities as are indicated by such re-calculation.

      In the event that, prior to the earlier of any Strategic Financing,
Financing in which this Note is converted into Securities, Public Offering or
January 24, 2001, the Company closes a Sale Transaction (as defined below), the
then outstanding principal amount hereof shall be automatically and
simultaneously converted into that number of shares of Common Stock

                                      -2-
<PAGE>

determined by dividing (a) such principal amount by (b) the price per share for
the Common Stock that is derived by dividing $500,000,000 by the number of
shares of Common Stock determined on a fully diluted basis immediately before
such closing. Any accrued and unpaid interest as of the date of such closing
shall be paid in cash. If reasonably practicable, the Company shall give Holder
written notice of the closing of any Sale Transaction at least thirty (30) days
before the occurrence thereof. As used in this Note, "Sale Transaction" means
any transaction or a series of related transactions that results, directly or
indirectly, in (i) any merger, consolidation, reorganization, recapitalization
or other business combination pursuant to which the business of the Company is
combined with that of another company and the Company is not the surviving
entity, or (ii) a sale or transfer of all or substantially all of the Company's
assets (including without limitation a lease of all or substantially all of the
assets of the Company with or without a purchase option) or (iii) the
acquisition of the Company by way of public or private offer, open market
purchase, negotiated purchase or otherwise; provided, however, that such term
shall not include any reincorporation of the Company in Delaware.

      Subject to the paragraph immediately following this paragraph, in the
event that, prior to the earlier of any Strategic Financing, Financing in which
this Note is converted into Securities, Sale Transaction or January 24, 2001,
the Company consummates a Public Offering (as defined below), the then
outstanding principal amount hereof shall be automatically and simultaneously
converted into that number of shares of Common Stock determined by dividing (a)
such principal amount by (b) the price per share for the Common Stock that is
derived by dividing $450,000,000 by the number of shares of Common Stock
determined on a fully diluted basis immediately before the effective date of
such Public Offering. Any accrued and unpaid interest as of such effective date
shall be paid in cash. As used in this Note, "Public Offering" means the
registration of the offering of any equity securities of the Company under the
Securities Act of 1933 pursuant to a registration on Form S-1 (or any analogous
form).

      Notwithstanding the foregoing, if the actual valuation of the Company upon
which such Public Offering is based is $700,000,000 or more (immediately prior
to such offering, and based on the number of shares of Common Stock determined
on a fully diluted basis immediately before the effective date of such
offering), then Holder may, at its option and in lieu of such automatic and
simultaneous conversion of such principal amount, elect to receive payment of
such principal amount in cash together with all accrued and unpaid interest. To
facilitate such election, not later than five (5) days prior to the effective
date of such Public Offering the Company shall deliver a written notice to
Holder stating in reasonable detail the actual valuation upon which such public
offering is based. Any such election by Holder shall be subject to and
conditional upon delivery by Holder to the Company on or before such effective
date or within ten (10) days thereafter of Holder's written election to receive
such cash payment, which election shall be binding and irrevocable. In the event
of such election, the Company shall pay the outstanding principal and accrued
and unpaid interest of this Note via wire transfer to an account designated by
Holder or by check forwarded to the address of Holder within twenty (20) days
after such effective date of such Public Offering. If Holder does not give
notice of such election within ten (10) days after such effective date, the
Company shall have the right to prepay this Note in whole, or in part from time
to time, without penalty or premium at any time thereafter.

      In the event the Company does not close any Strategic Financing, Financing
in which this Note is converted into Securities, Sale Transaction or Public
Offering by January 24, 2001, and

                                      -3-
<PAGE>

subject to and conditional upon delivery by Holder to the Company on or before
that date of Holder's written election to convert this Note in accordance with
this paragraph, the then outstanding principal amount hereof may be converted at
Holder's option into that number of shares of Common Stock determined by
dividing (a) such principal amount by (b) the price per share for the Common
Stock that is derived by dividing $375,000,000 by the number of shares of Common
Stock determined on a fully diluted basis immediately before any conversion of
this Note pursuant to this paragraph. Any accrued and unpaid interest as of the
date of such conversion shall be paid in cash. In the event the Company
determines that the same is necessary to preserve the Company's status as a
Subchapter S corporation under the Internal Revenue Code, and the Company
desires to preserve such status, then before, and as a condition to, any
conversion pursuant to this paragraph, the Company may require Holder to
transfer this Note to the members of Holder so that the Common Stock to be
issued upon such conversion shall be held by the members of Holder. Any such
transfer shall be done upon assignment of the original Note, duly endorsed, and
accompanied by a duly executed written instrument of transfer in form and
substance satisfactory to the Company as evidenced by the Company's written
acknowledgment of such written instrument of transfer.

      As soon as practicable after any conversion of this Note, the Company at
its expense will cause to be issued in the name of, or as directed by, and
delivered to or upon the order of, Holder or its transferees (as the case may
be), a certificate or certificates for the number of shares of Common Stock or
Securities to which Holder or such transferees shall be entitled upon such
conversion (bearing such legends as may be required by applicable state and
federal securities laws and/or otherwise advisable in the reasonable opinion of
legal counsel for the Company). Such conversion shall be deemed to have been
made upon the earlier of (a) in the event that a Strategic Financing, a
Financing in which this Note is converted into Securities or a Sale Transaction
is closed on or before January 24, 2001, on the closing of such financing or
transaction, (b) in the event that a Public Offering is closed on or before
January 24, 2001, on the effective date of such Public Offering or (c) in the
event that Holder shall have elected to convert this Note into shares of Common
Stock on or before January 24, 2001, immediately prior to the close of business
on the date (not later than January 24, 2001) that the Note shall have been
surrendered for conversion accompanied by written notice of election of such
conversion. No fractional shares will be issued upon any conversion of this
Note. If upon any conversion of this Note a fraction of a share results, the
Company at its option will pay the cash value of that fractional share or issue
a full share to Holder in lieu of such fractional share.

      If this Note is not converted into Common Stock or Securities pursuant to
the foregoing paragraphs, the principal and interest of this Note shall be
payable via wire transfer to an account designated by Holder or by bank or
cashier's check forwarded to the address of Holder as Holder shall from time to
time designate. If this Note is converted into Common Stock or Securities
pursuant to the foregoing paragraphs, this Note shall be deemed to be paid in
full, canceled and extinguished upon such conversion; provided, however, that
notwithstanding the foregoing the provisions above relating to multiple closings
and the paragraph above entitled "Recalculation Right" shall survive and be
fully enforceable by Holder in accordance with the terms thereof .

      The Company and all endorsers of this Note hereby waive notice,
presentment, protest and notice of dishonor. If, after maturity, this Note is
placed in the hands of an attorney for

                                      -4-
<PAGE>

collection or if it is collected through judicial, probate, bankruptcy, or
receivership proceedings, an additional reasonable amount shall be paid by
Company to Holder for attorney's fees.

      Except as set forth in the next succeeding sentence, this Note is not
assignable or transferable by Holder without the prior written consent of the
Company. Notwithstanding the aforementioned, Holder hereof may transfer all or a
portion of this Note (or the securities issuable on conversion hereof) to the
members of Holder upon delivery to the Company of an opinion of counsel for such
members to the effect that such transfer is pursuant to a valid exemption from
registration under the Securities Act of 1933, which opinion shall be reasonably
acceptable in form and substance to the Company. Any transfer of this Note shall
be done only upon assignment of the original Note, duly endorsed, and
accompanied by a duly executed written instrument of transfer in form and
substance satisfactory to the Company as evidenced by the Company's written
acknowledgment of such written instrument of transfer, which acknowledgment
shall not be unreasonably withheld or delayed. Interest and principal are
payable only to Holder or its permitted transferees. Holder and any permitted
transferees each agree to provide a Form W-9 to the Company promptly on request.

      The terms and conditions of this Note shall be governed by New York law,
without reference to principles of conflicts or choice of law. This Note is
governed by a Note Purchase Agreement which is herein incorporated by reference.

      All references to the Company herein shall be deemed to include its
successors and assigns, and all covenants, stipulations, promises and agreements
contained herein by or on behalf of the Company shall be binding upon its
successors and assigns, whether so expressed or not.

      No modification or waiver of any provision of this Note or consent to
departure therefrom shall be effective unless in writing and signed by the
Company and Holder.

      IN WITNESS WHEREOF, Real Time Strategies, Inc. d/b/a RTS Wireless has
caused this Note to be executed in its corporate name and this Note to be dated,
issued and delivered, all on the 24th day of January, 2000.

                                          Real Time Strategies, Inc. d/b/a
                                          RTS Wireless, a New York Corporation

                                          By: /s/ Spencer Kravitz
                                             ---------------------------------

                                          Title: Executive VP and COO
                                                ------------------------------

                                      -5-<PAGE>

                                                                    Exhibit 10.9

      THE SECURITY REPRESENTED BY THIS INSTRUMENT HAS BEEN, AND THE SECURITIES
ISSUABLE UPON CONVERSION, IF ANY, OF THIS INSTRUMENT IN ACCORDANCE WITH ITS
TERMS SHALL BE, ACQUIRED FOR INVESTMENT AND NOT WITH A VIEW TO, OR IN CONNECTION
WITH, THE SALE OR DISTRIBUTION THEREOF. NO SUCH SALE OR DISPOSITION MAY BE
EFFECTED WITHOUT AN EFFECTIVE REGISTRATION STATEMENT RELATED THERETO OR AN
OPINION OF COUNSEL ACCEPTABLE TO THE COMPANY THAT SUCH REGISTRATION IS NOT
REQUIRED UNDER THE SECURITIES ACT OF 1933.

                  REAL TIME STRATEGIES, INC. d/b/a RTS WIRELESS

                   NON-NEGOTIABLE CONVERTIBLE PROMISSORY NOTE

January 31, 2000                                                      $1,500,000
Plainview, New York

      For value received, Real Time Strategies, Inc. d/b/a RTS Wireless, a New
York corporation (the "Company"), hereby promises to pay to Monsoon Ventures
LLC, a New York limited liability company ("Holder"), $1,500,000 at the times
and in the manner hereinafter provided.

      This Note shall bear interest at a per annum rate equal to eight percent
(8%) compounded annually, and, subject to the conversion provisions set forth
below, shall be payable in full on January 31, 2001.

      Upon any closing by the Company of an equity financing transaction (as
defined below) with a publicly traded strategic investor (such investor, the
"Strategic Investor" and such financing, the "Strategic Financing") in any
amount, after the date hereof but before the earlier of any Financing in which
this Note is converted into Securities (as such terms are defined below), Sale
Transaction (as defined below), Public Offering (as defined below) or January
31, 2001, the then outstanding principal amount hereof shall be automatically
and simultaneously converted into that number of shares of common stock of the
Company (the "Common Stock") determined by dividing such outstanding principal
amount by (a) if Common Stock is issued in the Strategic Financing, the price
per share at which such Common Stock is sold in such financing or (b) if
preferred stock or debentures that are convertible into Common Stock are issued
in such financing (a "Convertible Security"), the effective price per share of
Common Stock into which such Convertible Security is convertible; provided,
however, that notwithstanding the foregoing, such price per share of Common
Stock shall in no event be less than the price per share that is derived by
dividing $250,000,000 by the number of shares of Common Stock determined on a
fully diluted basis (as defined below) immediately before such Strategic
Financing. If reasonably practicable, the Company shall give Holder written
notice of the closing of any Strategic Financing at least three (3) days before
the occurrence thereof and, in all events, no later than the date of such
closing. Subject to the foregoing, if the Strategic Financing is effected
through multiple closings, Holder will be issued Common Stock at the average
price for all closings, to the extent the closings have different prices. Any
accrued and unpaid interest as of the date of any such conversion shall be paid
in cash. As used in this Note, (a) "fully diluted"
<PAGE>

means all of the issued and outstanding shares of Common Stock, together with
the number of shares of Common Stock subject to options and warrants issued
under any stock option plan of the Company or otherwise to the extent such
options are either vested at the time of such determination or will with the
passage of time become vested within six months thereafter and (b) "equity
financing transaction" means any transaction in which the Company issues Common
Stock, a Convertible Security or another equity security.

      Subject to the paragraph immediately following this paragraph, upon any
closing by the Company of a non-public equity financing transaction of at least
$6,000,000 with a party other than a Strategic Investor after the date hereof
but before the earlier of any Strategic Financing, Sale Transaction, Public
Offering or January 31, 2001 (a "Financing"), the then outstanding principal
amount hereof shall be automatically and simultaneously converted into that
number of shares of stock of the class and series issued in the Financing, or
such other equity securities convertible into shares of stock as may be issued
in the Financing (in either case, the "Securities") determined by dividing (a)
such outstanding principal amount by (b) the price per security at which such
Securities are sold in the Financing; provided, however, that notwithstanding
the foregoing, if the actual valuation of the Company upon which such Financing
is based is $400,000,000 or more (immediately prior to such financing, and based
on the number of shares of Common Stock determined on a fully diluted basis
immediately before such Financing), then conversion of this Note shall not be
automatic but shall be at the option of Holder. If reasonably practicable, the
Company shall give Holder written notice of the closing of any Financing at
least five (5) days before the occurrence thereof and, in all events, no later
than the date of such closing. Any optional conversion of this Note in
connection with a valuation of more than $400,000,000 in accordance with this
paragraph shall be subject to and conditional upon delivery by Holder to the
Company on or before the date of such closing or within thirty (30) days
thereafter of Holder's written election to convert this Note. Subject to the
foregoing, if the Financing is effected through multiple closings, Holder will
be issued Securities at the average price for all closings, to the extent the
closings have different prices. Any accrued and unpaid interest as of the date
of any such conversion shall be paid in cash.

      Recalculation Right. Notwithstanding the foregoing, in the event (x) a
Financing occurs before any Strategic Financing and, in connection with such
Financing, the outstanding principal amount hereof is converted into Securities
and (y) within sixty (60) days after the closing of such Financing a Strategic
Financing is closed that is based on a valuation of the Company that is lower
(the "Lower Valuation") than the valuation upon which such Financing was based,
then the number of Securities into which such principal amount is convertible
shall be re-calculated utilizing the greater of $250,000,000 or the Lower
Valuation. Within thirty (30) days after the closing of any such Strategic
Financing at a Lower Valuation, the Company shall (a) give notice thereof to
Holder, together with a statement in reasonable detail showing the Lower
Valuation and such re-calculation (based on $250,000,000 or such Lower
Valuation, as the case may be) and (b) issue to Holder such additional
Securities as are indicated by such re-calculation.

      In the event that, prior to the earlier of any Strategic Financing,
Financing in which this Note is converted into Securities, Public Offering or
January 31, 2001, the Company closes a Sale Transaction (as defined below), the
then outstanding principal amount hereof shall be automatically and
simultaneously converted into that number of shares of Common Stock

                                      -2-
<PAGE>

determined by dividing (a) such principal amount by (b) the price per share for
the Common Stock that is derived by dividing $500,000,000 by the number of
shares of Common Stock determined on a fully diluted basis immediately before
such closing. Any accrued and unpaid interest as of the date of such closing
shall be paid in cash. If reasonably practicable, the Company shall give Holder
written notice of the closing of any Sale Transaction at least thirty (30) days
before the occurrence thereof. As used in this Note, "Sale Transaction" means
any transaction or a series of related transactions that results, directly or
indirectly, in (i) any merger, consolidation, reorganization, recapitalization
or other business combination pursuant to which the business of the Company is
combined with that of another company and the Company is not the surviving
entity, or (ii) a sale or transfer of all or substantially all of the Company's
assets (including without limitation a lease of all or substantially all of the
assets of the Company with or without a purchase option) or (iii) the
acquisition of the Company by way of public or private offer, open market
purchase, negotiated purchase or otherwise; provided, however, that such term
shall not include any reincorporation of the Company in Delaware.

      Subject to the paragraph immediately following this paragraph, in the
event that, prior to the earlier of any Strategic Financing, Financing in which
this Note is converted into Securities, Sale Transaction or January 31, 2001,
the Company consummates a Public Offering (as defined below), the then
outstanding principal amount hereof shall be automatically and simultaneously
converted into that number of shares of Common Stock determined by dividing (a)
such principal amount by (b) the price per share for the Common Stock that is
derived by dividing $450,000,000 by the number of shares of Common Stock
determined on a fully diluted basis immediately before the effective date of
such Public Offering. Any accrued and unpaid interest as of such effective date
shall be paid in cash. As used in this Note, "Public Offering" means the
registration of the offering of any equity securities of the Company under the
Securities Act of 1933 pursuant to a registration on Form S-1 (or any analogous
form).

      Notwithstanding the foregoing, if the actual valuation of the Company upon
which such Public Offering is based is $700,000,000 or more (immediately prior
to such offering, and based on the number of shares of Common Stock determined
on a fully diluted basis immediately before the effective date of such
offering), then Holder may, at its option and in lieu of such automatic and
simultaneous conversion of such principal amount, elect to receive payment of
such principal amount in cash together with all accrued and unpaid interest. To
facilitate such election, not later than five (5) days prior to the effective
date of such Public Offering the Company shall deliver a written notice to
Holder stating in reasonable detail the actual valuation upon which such public
offering is based. Any such election by Holder shall be subject to and
conditional upon delivery by Holder to the Company on or before such effective
date or within ten (10) days thereafter of Holder's written election to receive
such cash payment, which election shall be binding and irrevocable. In the event
of such election, the Company shall pay the outstanding principal and accrued
and unpaid interest of this Note via wire transfer to an account designated by
Holder or by check forwarded to the address of Holder within twenty (20) days
after such effective date of such Public Offering. If Holder does not give
notice of such election within ten (10) days after such effective date, the
Company shall have the right to prepay this Note in whole, or in part from time
to time, without penalty or premium at any time thereafter.

      In the event the Company does not close any Strategic Financing, Financing
in which this Note is converted into Securities, Sale Transaction or Public
Offering by January 31, 2001, and

                                      -3-
<PAGE>

subject to and conditional upon delivery by Holder to the Company on or before
that date of Holder's written election to convert this Note in accordance with
this paragraph, the then outstanding principal amount hereof may be converted at
Holder's option into that number of shares of Common Stock determined by
dividing (a) such principal amount by (b) the price per share for the Common
Stock that is derived by dividing $375,000,000 by the number of shares of Common
Stock determined on a fully diluted basis immediately before any conversion of
this Note pursuant to this paragraph. Any accrued and unpaid interest as of the
date of such conversion shall be paid in cash. In the event the Company
determines that the same is necessary to preserve the Company's status as a
Subchapter S corporation under the Internal Revenue Code, and the Company
desires to preserve such status, then before, and as a condition to, any
conversion pursuant to this paragraph, the Company may require Holder to
transfer this Note to the members of Holder so that the Common Stock to be
issued upon such conversion shall be held by the members of Holder. Any such
transfer shall be done upon assignment of the original Note, duly endorsed, and
accompanied by a duly executed written instrument of transfer in form and
substance satisfactory to the Company as evidenced by the Company's written
acknowledgment of such written instrument of transfer.

      As soon as practicable after any conversion of this Note, the Company at
its expense will cause to be issued in the name of, or as directed by, and
delivered to or upon the order of, Holder or its transferees (as the case may
be), a certificate or certificates for the number of shares of Common Stock or
Securities to which Holder or such transferees shall be entitled upon such
conversion (bearing such legends as may be required by applicable state and
federal securities laws and/or otherwise advisable in the reasonable opinion of
legal counsel for the Company). Such conversion shall be deemed to have been
made upon the earlier of (a) in the event that a Strategic Financing, a
Financing in which this Note is converted into Securities or a Sale Transaction
is closed on or before January 31, 2001, on the closing of such financing or
transaction, (b) in the event that a Public Offering is closed on or before
January 31, 2001, on the effective date of such Public Offering or (c) in the
event that Holder shall have elected to convert this Note into shares of Common
Stock on or before January 31, 2001, immediately prior to the close of business
on the date (not later than January 31, 2001) that the Note shall have been
surrendered for conversion accompanied by written notice of election of such
conversion. No fractional shares will be issued upon any conversion of this
Note. If upon any conversion of this Note a fraction of a share results, the
Company at its option will pay the cash value of that fractional share or issue
a full share to Holder in lieu of such fractional share.

      If this Note is not converted into Common Stock or Securities pursuant to
the foregoing paragraphs, the principal and interest of this Note shall be
payable via wire transfer to an account designated by Holder or by bank or
cashier's check forwarded to the address of Holder as Holder shall from time to
time designate. If this Note is converted into Common Stock or Securities
pursuant to the foregoing paragraphs, this Note shall be deemed to be paid in
full, canceled and extinguished upon such conversion; provided, however, that
notwithstanding the foregoing the provisions above relating to multiple closings
and the paragraph above entitled "Recalculation Right" shall survive and be
fully enforceable by Holder in accordance with the terms thereof .

      The Company and all endorsers of this Note hereby waive notice,
presentment, protest and notice of dishonor. If, after maturity, this Note is
placed in the hands of an attorney for

                                      -4-
<PAGE>

collection or if it is collected through judicial, probate, bankruptcy, or
receivership proceedings, an additional reasonable amount shall be paid by
Company to Holder for attorney's fees.

      Except as set forth in the next succeeding sentence, this Note is not
assignable or transferable by Holder without the prior written consent of the
Company. Notwithstanding the aforementioned, Holder hereof may transfer all or a
portion of this Note (or the securities issuable on conversion hereof) to the
members of Holder upon delivery to the Company of an opinion of counsel for such
members to the effect that such transfer is pursuant to a valid exemption from
registration under the Securities Act of 1933, which opinion shall be reasonably
acceptable in form and substance to the Company. Any transfer of this Note shall
be done only upon assignment of the original Note, duly endorsed, and
accompanied by a duly executed written instrument of transfer in form and
substance satisfactory to the Company as evidenced by the Company's written
acknowledgment of such written instrument of transfer, which acknowledgment
shall not be unreasonably withheld or delayed. Interest and principal are
payable only to Holder or its permitted transferees. Holder and any permitted
transferees each agree to provide a Form W-9 to the Company promptly on request.

      The terms and conditions of this Note shall be governed by New York law,
without reference to principles of conflicts or choice of law. This Note is
governed by a Note Purchase Agreement which is herein incorporated by reference.

      All references to the Company herein shall be deemed to include its
successors and assigns, and all covenants, stipulations, promises and agreements
contained herein by or on behalf of the Company shall be binding upon its
successors and assigns, whether so expressed or not.

      No modification or waiver of any provision of this Note or consent to
departure therefrom shall be effective unless in writing and signed by the
Company and Holder.

      IN WITNESS WHEREOF, Real Time Strategies, Inc. d/b/a RTS Wireless has
caused this Note to be executed in its corporate name and this Note to be dated,
issued and delivered, all on the 31st day of January, 2000.

                                          Real Time Strategies, Inc. d/b/a
                                          RTS Wireless, a New York Corporation

                                          By: /s/ Spencer Kravitz
                                             ---------------------------------

                                          Title: Executive VP and COO
                                                ------------------------------

                                      -5-

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