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                                                                   EXHIBIT 10.19

                               RADIO METRIX, INC.

TELEPHONE              1515 RINGLING BOULEVARD, SUITE 800          FAX
(813)-366-9361               SARASOTA, FLORIDA 34236          (813)-366-9507
                                 (800)-242-7489

                                                December 1, 1994

Mr. Pete Lefferson, P.E.
6102. 7th Avenue North
St. Petersburg, Florida 33710-7015

Dear Pete:

        This correspondence confirms the Award for you to participate in two
percent of the net profits received by Radio Metrix Inc. from the sale of
sliding gates, overhead doors and all other products authorized or manufactured
by Radio Metrix Inc. which incorporate the multiple antenna sensing technology
worked on by you. This Award expands the previous Award granted to you on
September 23, 1993 for two percent of the net profits received by Radio Metrix
Inc. for the sale of parking barrier boom products which also incorporates
technology worked on by you.

        All of the definitions, terms, conditions, limitations and requirements
set forth in the September 23, 1993 Award to you are incorporated herein by
reference.

        The foregoing Award is subject to the condition that you provide ongoing
professional services (during lifetime) in connection with the commercialization
and ongoing development and marketing of the products covered by this Award.
Upon your death or disability, the Award is vested, even though you will not be
able to provide ongoing professional services.

       As consideration for this Award, you agree to assign to Radio Metrix Inc.
any interest or rights you may have as inventor of the multiple antenna sensing
technology or any other inventions relating to the product applications
described in this Award.

        The Award granted herein is in recognition of the excellent professional
services demonstrated by you in connection with the development of the multiple
antenna sensing technology and your

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excellent efforts in coordinating with Radio Metrix Inc. and Brent Simon in
this ongoing development effort. We at Radio Metrix Inc. appreciate your talent,
professionalism and dedication.

        We look forward to a long-term, professional relationship.

                                            Sincerely, Radio Metrix Inc.

                                            /s/ STEPHEN A. MICHAEL
                                            Stephen A. Michael
                                            President

SAM\kcm

        Net profit interest in the multiple antenna sensing technology based
Radio Metrix Inc. products and all terms and conditions related thereto are
hereby accepted.

                                              /s/ PETE LEFFERSON, P.E.
                                              ----------------------------------
                                              Pete Lefferson, P.E.

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                               RADIO METRIX, INC.

TELEPHONE              1515 RINGLING BOULEVARD, SUITE 800          FAX
(813)-366-9361               SARASOTA, FLORIDA 34236          (813)-366-9507
                                 (800)-863-9361

                                               September 23, 1993

Mr. Pete Lefferson, P.E.
6101 7th Avenue North
St. Petersburg, Florida 33710-7015

Dear Pete:

        This correspondence confirms the Award for you to participate in two
percent of the net profit received by Radio Metrix Inc. from the sale of parking
barrier boom products which incorporate the sensing technology worked on by you.
The Award is in recognition of the excellent professional services demonstrated
by you in connection with the development of the parking barrier boom products,
and your agreement to provide ongoing commercialization services for the barrier
boom product. We at Radio Metrix Inc. appreciate your talent, professionalism,
and dedication.

        The Award entitles you to two percent of the net profit received by
Radio Metrix Inc. from the sale of parking barrier boom products which
incorporate the sensing technology worked on by you. For purposes hereof, the
term "Net Profits" shall mean receipts (after deduction for discounts, refunds,
rebates, and other similar payments or adjustments) from the sale of parking
barrier boom products less all expenses associated therewith, which shall
include, but shall not be limited to, license and royalty payments required to
be made by Radio Metrix Inc., manufacturing costs, marketing costs, general
overhead and administrative costs, ongoing product development, ownership, and
marketing costs. Radio Metrix Inc. shall, in the exercise of its discretion,
determine the amount and allocation of expenses for purposes hereof. Payment to
you of the two percent net profit interest will be made on a quarterly basis and
will be accompanied by a short-form statement of Net Profits. Sale of products
shall mean product sales in the ordinary course of business and shall also
include license agreements or sale of technology. In the event all or
substantially all of the stock or assets of Radio Metrix Inc. are sold, Radio
Metrix Inc. will allocate the purchase price among the products (with the
allocation being made in Radio Metrix Inc.'s discretion) and you will receive
two percent of the net proceeds of said sale allocated to the parking barrier
boom products.

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        The Award is subject to the condition that you provide ongoing
professional services (during lifetime) in connection with the commercialization
and ongoing development and marketing of the barrier boom product. Upon your
death or disability, the award is vested even though you will not be able to
provide ongoing professional services. While major assignments will, upon mutual
agreement, result in the payment of your normal hourly compensation, normal
commercialization, development, and marketing, such as FCC opinions, products
modifications, customer specifications or adjustments, advice and consulting and
marketing support will be compensated solely through the net profit Award
without any additional hourly compensation.

        Radio Metrix Inc. looks forward to an ongoing relationship with you in
connection with other products now being developed by Radio Metrix Inc. As these
products reach commercialization, Radio Metrix Inc. may, but is not required to,
offer to you an interest in the Net Profits of such additional products. Until
such an interest is offered to you and accepted by you, your work on those
products will be paid on an hourly basis or as otherwise agreed. For each
product, in addition to the parking barrier boom in which you are subsequently
granted a net profit interest, a specific written Award will be issued.

        We look forward to a long-term, professional relationship.

                                                Sincerely,

                                                Radio Metrix Inc.

                                                /s/ STEPHEN A. MICHAEL
                                                Stephen A. Michael
                                                President

SAM\cls

        Net profit interest in the parking barrier boom Radio Metrix Inc.
product is hereby accepted.

                                        /s/ PETE LEFFERSON, P.E.
                                        -------------------------------
                                       Pete Lefferson, P.E.

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                                                                   EXHIBIT 10.20

                                    AGREEMENT

        This Agreement is made this 13th day of Oct.      , 1996 by and between
("Radio Metrix, Inc.") and Carl Burnett ("Mr. Burnett").

                                    RECITALS

        WHEREAS, the Company is in the business of manufacturing and marketing
sensing devices utilizing radio waves in a unique fashion; and

        WHEREAS, Mr. Burnett has served as an employee of the Company where part
of his duties were to further develop and enhance the Company's products and
technology; and

        WHEREAS, within the scope of Mr. Burnett's duties for the Company he
enhanced the Company's safety system product and technology by his invention of
an electrical noise canceling circuit; and

        WHEREAS, the parties hereto wish that Mr. Burnett assign all of his
rights, title and interest in and to Mr. Burnett's invention and any future
modifications or improvements thereto ("Invention") to the Company and that the
Company compensate Mr. Burnett fairly for such assignment.

        NOW, THEREFORE, in consideration of the premises and the mutual
representations, warranties, covenants and agreements set forth herein, and for
other good and valuable consideration in hand received, the receipt and
sufficiency of which is hereby acknowledged, the parties hereby agree as
follows:

        1. Confirmation of Recitals. The foregoing recitals are true and
correct and are hereby ratified and confined by the parties and are made an
integral part of this Agreement; as such, the recital shall be used in any
construction of this Agreement especially as it relates to the intent of the
parties.

        2. Assignment. Mr. Burnett hereby assigns and conveys all of his right,
title and interest in and to the Invention to the Company.

        3. Payment. In consideration of Mr. Burnett's assignment and
conveyance of the Invention to the Company, the Company agrees to compensate Mr.
Burnett for said assignment as follows:

        A.      In those instances when the Invention is utilized by the Company
                or it assigns in products sold by the Company, the Company shall
                pay Mr. Burnett the smaller of $1.00 or 1% of the amount
                collected by the Company from the sale of each finished product
                in which the Invention is utilized. Such payments shall be made
                to Mr. Burnett at

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                the end of each quarter within which products using the
                Invention were sold and the sale price collected. Accompanying
                each quarterly payment shall be an accounting clearly
                identifying the type and number of products sold in the
                quarterly period.

        B.      In instances where the Company licenses to its designees or
                other third parties (i.e. parties other than an affiliate of the
                Company created to manufacture or market products utilizing the
                Company's technologies), the Invention independent of other
                technology owned or licensed by the Company, the Company shall
                pay to Mr. Burnett, 10% of the license fees or royalties
                received by the Company from any such designees or third
                parties, and such payment shall be paid to Mr. Burnett either
                on a one time lump sum basis or an ongoing periodic basis as may
                be mutually agreeable to the Company and Mr. Burnett on a case
                by case basis in light of the circumstances surrounding the
                license agreement(s), if any, entered into between the Company
                and its designees and third parties from time to time.

        C.      In instances where the Company licenses to its designees or
                other third parties (i.e. parties other than an affiliate of the
                Company created to manufacture or market products utilizing the
                Company's technologies) the Invention as part of other
                technology owned or licensed by the Company, the Company shall
                pay to Mr. Burnett 1% of the license fees or royalty fees
                received by the Company from such designees or third parties
                from license of combined technologies. Such fee shall be paid to
                Mr. Burnett in the same fashion as payments required under
                subparagraph B above.

        3. Patent Application, Fees and Expenses. In the event the Company, in
its discretion, wishes to pursue patenting the Invention, then in such event,
the Company agrees that it shall be responsible for and shall pay all fees,
costs and expenses customarily incurred when filing a patent application and
acquiring a patent in the jurisdictions selected by the Company. Further, the
Company agrees that it shall be responsible for and shall pay all cost, fees and
expenses customarily incurred in maintaining a patent(s) once acquired for so
long as the Company deems the maintenance to be appropriate, and the Company
further agrees that it shall pay all fees, costs and expenses customarily
related to prosecuting and defending infringement claims. Should the Company
determine not to maintain or defend the patent, the Company shall provide Mr.
Burnett with written notice and an opportunity to undertake the maintenance or
defence.

        4. Cooperation. Mr. Burnett shall, upon the request of the

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Company, execute and assign any and all applications, assignments, and other
instruments which the Company shall deem necessary in order to apply and obtain
Letters Patent of the United States or foreign countries for the Invention and
in order to assign and convey to the Company the sole and exclusive right, title
and interest, in and to the Invention, applications and patents related thereto.

        5. Confidential Information. Mr. Burnett agrees to keep confidential and
not make any unauthorized use or disclosure, during or subsequent to his
employment with the Company of any knowledge or information of an unpublished,
or confidential or proprietary nature regarding the Invention or relating to the
business, research, technologies, products or development activities of the
Company, or to its manufacturing processes or its trade secrets, or to its
sources of supply or lists of customers, or to marketing or product plans or
contemplated actions of the Company.

        6. Governing Law. This Agreement shall be governed by and construed in
accordance with the laws of the State of Florida. The parties agree that venue
for enforcement of any type under this Agreement shall be in Sarasota County,
Florida.

        7. Miscellaneous. No change, addition, deletion, or amendment of this
Agreement shall be valid or binding upon Mr. Burnett or the Company unless in
writing and signed by Mr. Burnett and the Company. The rights of the Company
under this Agreement may be assigned; however, the covenants and agreements of
Mr. Burnett pursuant to this Agreement cannot be assigned. The title of this
Agreement and the paragraph headings of this Agreement are not substantive parts
of this Agreement and shall not limit or restrict the Agreement in any way. In
construing this Agreement, neither of the parties hereto shall have any term or
provision of this Agreement construed against such party solely by reason of
such party having drafted same as each provision of this Agreement is deemed by
the parties to have been jointly drafted by the Company and Mr. Burnett.

        8. Mr. Burnett's Acknowledgment. The Mr. Burnett, acknowledges that
Mr. Burnett has voluntarily and knowingly entered into this Agreement and that
this Agreement encompasses the full and complete agreement between the parties
with respect to the matters set forth herein.

        9. Legal Representation. This Agreement has been prepared for the
Company by DUFFEY & DOLAN, P.A., its legal counsel. A principle of DUFFEY &
DOLAN, P.A., Mr. Duffey is also a stockholder and officer of the Company. Mr.
Burnett has been expressly advised that neither DUFFEY & DOLAN, P.A. nor Mr.
Duffey have provided any legal advise to him and that he may wish to seek
independent legal counsel in connection with this Agreement or matters related

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thereto.

CARL BURNETT                             RADIO METRIX, INC.

By: /s/ CARL BURNETT                     By: /s/ STEPHEN A. MICHAEL
   ----------------------------             -------------------------------
Print:  Carl Burnett                     Print: Stephen A. Michael
                                         Title: President

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