PURCHASE AND SALE AGREEMENT


This Purchase and Sale Agreement (hereinafter "Agreement") is entered into as of
July 11th, 2000, by and among Globaltron Communications Corporation, a company
Incorporated under the laws of Florida, U.S.A., with principal offices located
at New World Tower, 100 North Biscayne Boulevard, Suite 2500, Miami, Florida,
U.S.A. (hereinafter "Purchaser"), Tropico Sistemas e Telecomunicacoes S.A., a
company incorporated under the laws of Brazil, with principal offices located at
Avenida Selma Parada 201 (Galleria Office Park Ed 4), Campinas, State of Sao
Paulo, Brazil (hereinafter "Vendor"), and Singer Products Inc., a company
Incorporated under the laws of Florida, USA, with principal offices located at
1840 West 49th Street, Suite 501, Hialeah, Florida, U.S.A. and acting herein
both in its capacity as Authorized Sales Representative of Tropico (hereinafter
"Singer").

WHEREAS, the Parties desire to commence the partial execution of the objectives
of the Memorandum of Understanding (hereinafter "MOU"), signed between them on
May 13, 2000, in which the purchase of certain switches was contemplated,

NOW, THEREFORE, in consideration of the mutual covenants and promises contained
in this Agreement, the parties agree as follows:

                                     PART I
                                PURCHASE AND SALE

1 Nature of Transaction

       1.1  On the terms and conditions set forth in this Agreement, Purchaser
            agrees to purchase and Vendor agrees to sell certain telephony and
            transit switches, as well as certain related services, the
            description, quantities and prices of which are set forth in Exhibit
            A hereto (the "Products").

            1.1.1   Vendor declares that the Products are either new or of
                    recent manufacture and includes, among others, the features
                    described below:
                          -Standard telephony services and ISDN capabilities;
                          -Local and tandem switching capabilities;
                          -Supplementary services;
                          -SSC7-ETSI (for Colombia, Peru and other countries)
                           and ANSI (USA) signaling including STP capability;
                          -SSC7 over IP signaling;
                          -SSP function for Intelligent Network;


<PAGE>

Purchase and Sale Agreement                                              Page 2


                        - V5.1 and V5.2 capabilities and interfaces;
                        - Voice announcement;
                        - Remote Access Server function integrated in the switch
                          (for ISP access front and Internet off-load);
                        - TSC or Tropico Softswitch controller, able to provide
                          call control according to MGCP protocol and network
                          model;
                        - H.323 signaling interoperability (mediation gateway);
                        - CDR generation with AMA format for all the calls
                          controlled by the switch (signaling independent);
                        - Billing recording for contingency;
                        - Billing batch availability through FTP transfer;
                        - Remote or local OA&M;
                        - Voice mail and pre-paid services, with respective
                          service management platform.

       1 .2     Except where it conflicts with the terms and conditions of this
                Agreement the Vendor proposal set for the in Exhibit B hereof is
                made a part of this Agreement.

       1.3      Vendor declares that the scope of supply includes installation
                and commissioning supervision as well as the system engineering
                of Vendor's supplied products. The installation, equipment tests
                and the services in the country of destination of the products
                will be performed by Singer, under a separated agreement
                "Services Agreement" dated July 10th 2000.

2 Deployment Phases

       2.1      The implementation of the MOU shall be conducted in several
                phases, of which this Agreement constitutes the first phase
                ("Phase One").

       2.2      In this Phase One, the Products shall be subject to four
                deployment groupings (hereinafter individually referred to as
                "Deployment Group").

       2.3      The first Deployment Group shall consist of:

                a) One telephone transit switch for Medellin, Colombia Satellite
                   Hub for Orbitel Project, with 80 E1s;

                b) One telephone transit switch for New York, with 80 E1s; and

                c) One telephone transit switch for Lima, Peru Satelite Hub,
                   with 40 E1s.

       2.4         The second Deployment Group shall, consist of:


<PAGE>

Purchase and Sale Agreement                                               Page 3


             d)    One local switch for Wireless Local Loop access network for
                   Bogota, Colombia, equipped with a total number of 113 E1s;

             e)    One local Switch for Wireless Local Loop access network for
                   Cali, Colombia equipped with the total number of 135 E1s;

             f)    One local switch for Wireless Local Loop access network for
                   Cartagena, Colombia equipped with the total number of 28 E1s;


       2.5      The third Deployment Group shall consist of:

             g)    One local switch for Wireless Local Loop access network for
                   Medellin, Colombia equipped with the total number of 57 E1s

             h)    One switch for Wireless Local Loop access network for
                   Barranquilla, Colombia equipped with the total number of 57
                   E1s

             i)    Expansion of the New York transit switch, with 120 additional
                   E1s.

             j)    Expansion of the Medellin transit switch, with 80 additional
                   E1s;

             k)    Expansion of the Peru Satellite Hub transit switch, with 40
                   additional E1s;

       2.6      The fourth Deployment Group shall consist of:

                l) Expansion of the New York transit switch, with 130 additional
                   E1s;

                m) Expansion of the Bogota local switch for Wireless Local Loop,
                   access network equipped with the total number of 97 E1s

                n) Expansion of the Cali local switch for Wireless Local Loop,
                   access network equipped with the total number of 80 E1s;

                o) Expansion of the Cartagena local switch for Wireless Local
                   Loop, access network equipped with the total number of 25
                   E1s

                p) Five local switches for Wireless Local Loop access network
                   equipped with the total number of 28 E1s one for each of the
                   following cities In Colombia: Pereira, Cucuta, Bucaramanga,
                   Santa Maria and Villavicencio.


<PAGE>

Purchase and Sale Agreement                                               Page 4


3 Prices and Payments

       3.1      The purchase price for the Products (hereinafter "Purchase
                Price"), as set forth in Exhibit A, shall be Five Million, Three
                Hundred and Forty Thousand (US$5,340,000) dollars of the United
                States of America, allocated by Deployment Group as follows:

            3.1.1    First Deployment Group

                     The portion of the Purchase Price for the Products included
                     in the first Deployment Group shall be One Million and
                     Twenty Five Thousand (US$ 1,025,000.00) dollars of the
                     United States of America.

            3.1.2    Second Deployment Group

                     The portion of the Purchase Price for the Products included
                     in the second Deployment Group shall be Eight Hundred
                     Ninety Thousand (US$ 890,000.00) dollars of the United
                     States of America.

            3.1.3    Third Deployment Group

                     The portion of the Purchase Price for the Products included
                     in the third Deployment Group, shall be One Million Five
                     Hundred Sixteen Thousand (US$ 1,516,000.00) dollars of the
                     United States of America.

            3.1.4    Fourth Deployment Group

                     The portion of the Purchase Price for the Products included
                     in the fourth Deployment Group, shall be One Million Nine
                     Hundred and Nine Thousand (US$ 1,909,000.00) dollars of
                     the United States of America.


       3.2    Purchaser shall pay Vendor the Purchase Price in accordance with
              the following payment schedule:

            3.2.1    Fifteen (15) percent of the Purchase Price of each partial
                     or total shipment shall be paid before the date of
                     shipment.

            3.2.2    Eighty-five (85%) percent of the Purchase Price of each
                     partial or total shipment delivered FOB, upon presentation
                     of invoice and shipping documents.



<PAGE>

Purchase and Sale Agreement                                               Page 5


       3.3    The eighty-five (85%) percent part of the Purchase Price
              (hereinafter "Financed Purchase Price") shall be paid by means of
              a financing arrangement described in Exhibit C hereto.

       3.4    By entering into this Agreement; Purchaser agrees to the financing
              contemplated In Exhibit C and will enter into all such contracts
              and other documentation as are contemplated in Exhibit C. Exhibit
              C refers to certain guarantees. Purchaser agrees that in the event
              Vendor and/or any other party obligated on any guarantee referred
              to therein makes one or more payments under any such guarantee,
              Purchaser shall be unconditionally obligated to reimburse Vendor
              and any other such party the full amount of all such payments,
              together with interest thereon and all other sums payable in
              connection therewith pursuant to the agreement or agreements to be
              entered into in connection with the financing contemplated in
              Exhibit C.

       3.5    Purchaser shall reimburse Vendor for hotel, meals, transportation
              (including air travel) and administrative expenses, Incurred for
              the performance of services of training, installation and
              maintenance of the Products described in this Agreement. Such
              services shall be rendered by Vendor with no additional charges
              other than the ones mentioned herein.

       3.6    The reimbursements to Vendor mentioned in this Clause shall be
              made by Purchaser on the fifth (5th) business day of the month
              subsequent to that in which expenses were incurred.

4         Delivery

       4.1    Products shall be manufactured by Vendor and delivered to
              Purchaser in accordance with the schedule contained in Exhibit D
              hereof.

       4.2    Purchaser and Vendor together with Singer shall revise quarterly
              the configuration and delivery of all items of the Products and
              Services to be supplied by Vendor and Singer.

       4.3    Delivery of the Products to Purchaser shall be deemed completed
              when the respective Product is delivered to carrier at the
              shipping point specified in Exhibit D hereto (FOB, per INCOTERMS
              1990), at which time all risks of loss or damage shall be borne by
              Purchaser.

       4.4    Purchaser shall be responsible for arranging for the importation
              of the Products into the respective country of destination and for
              subsequent delivery to the installation sites (hereinafter
              "Installation Sites"), and for all the associated costs.



<PAGE>
          Purchase and Sale Agreement                                     Page 6


       4.5    Purchaser shall be responsible for locating and adequately
              preparing the Installation Sites for the receipt and operation of
              the Products. Failure to have an Installation Site fully prepared
              for the installation of the Product shall render Purchaser liable
              for all additional costs and expenses incurred by Vendor and/or
              Singer as a result thereof.

5      Warranties and Limitations

       5.1    Vendor warrants, for the benefit of Purchaser only, that, at the
              time of completion of delivery of the Products, the Products shall
              conform in all material aspects to the specifications set forth in
              Exhibit B hereto Vendor does not warrant that the operation of the
              products will be error free.

       5.2    As Purchaser's exclusive remedy for any nonconformity or defect in
              the Products, Vendor shall during the 18-month period following
              the delivery of the Products, or 12 months after installation,
              whichever occurs first, correct or cure such nonconformity or
              defect. Purchaser acknowledges that Vendor may require Purchaser
              to deliver defective Product to Vendor's authorized service
              centers for maintenance or repair.

       5.3    For non-conformities or defects during the warranty period
              Purchaser shall send, at its own expense, the respective Products
              for maintenance or repair to Vendor's authorized service centers;
              or to:

                           Promon Electronica da Amazonia Ltda.
                           Avenida Barbosa da Cunha, 309 Parte B -
                             Bairro Guanabara
                           CEP 13070 Campinas - S.P. Brasil

              In this case, Vendor shall repair the Products within thirty (30)
              days after receipt of the Products at the address specified above
              and shall, at its own expense, provide for shipment to the
              Installation Site indicated by Purchaser, except if any or all the
              conditions set forth in 5.4 below apply.

       5.4    Vendor shall bear no responsibility for correcting, curing, or
              otherwise remedying any nonconformity or defect in the Products if
              any or all of the following conditions apply: (1) the Products are
              not properly installed; (2) the Products are not maintained and
              operated under normal and specified conditions by qualified
              personnel; (3) the Products incorporate spare or replacement parts
              other than those purchased under this Agreement; (4) the Products
              have been altered, abused, misused or taken apart; (5) the
              nonconformity or defect has not been reported to Vendor within
              such 12-month period; (6) the non-conformity or defect has arisen
              as a result of damage to the Products occurring subsequent


<PAGE>

Purchase and Sale Agreement                                               Page 7


              to delivery of the Product; or (7) the non-conformity or defect is
              not provenly due to Vendor's sole fault.

       5.5    With the sole exception of the preceding undertakings, VENDOR
              DISCLAIMS ANY AND ALL PROMISES, REPRESENTATIONS AND WARRANTIES,
              EXPRESS OR IMPL1ED, WITH RESPECT TO THE PRODUCTS (INCLUDING,
              WITHOUT LIMITATION, THE EQUIPMENT AND THE PROGRAMS EMBEDDED
              THEREIN), INCLUDING ITS CONDITION, THE EXISTENCE OF ANY LATENT OR
              PATENT DEFECTS, AND ITS MERCHANTABILITY OR FITNESS FOR ANY
              PARTICULAR USE, SATISFACTORY QUALITY, AGAINST INFRINGEMENT OR
              ARISING FROM A COURSE OF DEALING, USAGE, OR TRADE PRACTICE, ALL OF
              WHICH ARE HEREBY EXCLUDED TO THE EXTENT ALLOWED BY APPLICABLE LAW.
              VENDOR FURTHER DISCLAIMS ANY AND ALL PROMISES, REPRESENTATIONS,
              AND WARRANTIES, EXPRESS OR IMPLIED, WITH RESPECT TO THE NATURE AND
              QUALITY OF ANY OTHER PERFORMANCE BY VENDOR HEREUNDER.

       5.6    Liability of Vendor for breach of any and all warranties hereunder
              is expressly limited to the repair, replacement or refund of the
              purchase price of defective products as set forth in this section,
              and in no event shall Vendor be liable for special, incidental or
              consequential damages by reason of any breach of warranty or
              defect in materials or workmanship. Vendor shall not be
              responsible for repair, replacement refund of purchase price of
              products which have been subjected to neglect, accident or
              improper use, or which have been altered by other than authorized
              Vendor personnel.

              Vendor's warranty obligations and Purchaser's remedies thereunder
              are solely and exclusively as stated herein. In no case shall
              Vendor be liable for indirect kinds of damages, including but not
              limited to special, incidental, punitive, and consequential
              damages, or loss of capital, revenue, or profits. In no event
              shall Vendor's liability to Purchaser, or any party claiming
              through Purchaser, be in excess of the actual sales price paid by
              Purchaser for any items supplied hereunder.

       5.7    Notwithstanding any other provisions of this contract, under no
              circumstances shall either party be liable to the other party or
              any third party claiming under the other party for special,
              incidental, indirect, punitive, or consequential damages, as a
              result of a breach of any provision of this contract. Purchaser
              hereby Indemnities Vendor against all loss or liability from
              claims by customer or a third party arising out of or relating to
              Purchaser's installation, operation, or use of the equipment,
              whether on account of negligence or otherwise.



<PAGE>
Purchase and Sale Agreement                                               Page 8


       5.8    Notwithstanding anything herein to the contrary, in no event shall
              Vendor be liable to Purchaser for any loss of use, loss of data,
              anticipated revenues or profit, whether caused directly or
              indirectly; any incidental, special, or consequential damages; or
              any claims or actions brought against Purchaser by any third
              party.

       5.9    The Programs, as defined in Exhibit A hereto, shall be considered
              as part of the Products, for all purposes of this Agreement, being
              subject to the same limitations, including, but not limited to,
              warranty restrictions and liability cap. IN ADDITION, BY
              INITIALING EXHIBIT A HERETO, PURCHASER SHALL BE DEEMED TO HAVE
              FULLY UNDERSTOOD AND AGREED TO THE "LICENSING CONDITIONS FOR THE
              PROGRAMS" CONTAINED THEREIN.

6         Vendor Substitution

       6.1    Vendor, at its sole discretion, may perform all or part of its
              obligations hereunder through its wholly owned subsidiary Promon
              Electronica da Amazonia Ltda. (hereinafter "Vendor's Subsidiary"),
              and may instruct Purchaser in writing to pay Vendor's Subsidiary
              directly, with the understanding that Vendor shall cause Vendor's
              Subsidiary to be bound by all of the terms and conditions of this
              Agreement and it is further agreed that Vendor shall remain
              jointly and severally with Vendor's Subsidiaries for the latter's
              responsibilities hereunder.

7         Training and User Materials

       7.1    Vendor shall provide Purchaser training services (described in
              Exhibit E hereto), free of charge, to selected Purchaser qualified
              personnel, up to 15 people. All other costs and expenses
              associated with the training, such as, without limitation, travel
              and living expenses, shall be for the account of Purchaser.

       7.2   Vendor may from time to time furnish Purchaser diagrams,
             specifications, documentation and other materials, including user
             manuals related to the use and servicing of the Products. Vendor
             reserves all right, title and interest in such materials, including
             without limitation all intellectual property rights.

       7.3   The documentation and user manuals will be supplied by the Vendor
             in the official language of the country of destination of the
             equipment.

<PAGE>

Purchase and Sale Agreement                                               Page 9


                                    PART III
                               GENERAL PROViSIONS
8      Termination

       Either Vendor or Purchaser may terminate this agreement immediately
       without need of previous judicial or arbitration resolution, in the event
       that the other party (a) has materially breached any of its obligations
       under the Agreement and alter notification thereof does not remedy the
       breach within thirty (30) days or (b) has been adjudged a bankrupt, has
       become insolvent by any test, has filed any petition in any court of
       bankruptcy or equivalent court for receivership, reorganization,
       bankruptcy, arrangement or relief from debts or creditors, or for any
       other relief whatsoever, has had any such petition filed against it, or
       has made any assignment for the benefit of creditors or has any
       substantial part of its assets subjected to any involuntary lien which is
       not removed within thirty (30) days after notice thereof.

9      Waiver

       No delay or failure by either Party in exercising any right under this
       Agreement, nor any partial exercise thereof, shall be deemed to
       constitute a waiver of said right or of any other right.

10     Effect of Breach

       10.1   In addition to any other rights, privileges, power or remedies of
              Vendor hereunder or under law, upon the occurrence of a breach of
              the Agreement or of any other event which gives rise to the
              Vendor's right to terminate the Agreement, the Purchaser shall
              remain liable for any and all monetary or financial obligations
              arising under this Agreement and Vendor shall have the right to
              accelerate and declare all obligations of the Purchaser to be due
              and payable by Purchaser as a liquidated sum and to proceed
              against the Purchaser and/or repossess so much of the Products as
              remain in its possession.

       10.2   Force Majeure

              Vendor and Singer shall not be responsible for delays or failures
              in its performance hereunder resulting from Acts of God,
              earthquakes, shortages of supplies, transportation difficulties,
              labor disputes, riots, war, fire, epidemics, and any acts,
              omissions or events beyond its control. Performance times under
              this agreement shall be extended for



<PAGE>

Purchase and Sale Agreement                                              Page 10


              a period of time equivalent to the time lost because of a delay
              which is excusable under this provision.

11     Severability

       Should any condition or term, or any part thereof, contained in this
       Agreement be unenforceable or prohibited by law or by any present or
       future local, municipal, provincial/state or national/federal
       legislation, then such Article, condition, term or part thereof, shall be
       amended, and is hereby amended so as to be in compliance with said
       legislation or law but, if such Article, condition or term, or part
       thereof cannot be amended so as to be in compliance with any such
       legislation or law then such Article, condition, term or part thereof
       shall be deemed severed from this Agreement, and all the rest of the
       Articles, terms and this Agreement, shall remained unimpaired.

12     Assignments

       Except as otherwise expressly provided herein, neither this Agreement nor
       any of the rights and obligations contained therein may be assigned by
       either party without the prior written consent or the other parties.

13     Governing Law and Venue

       This Agreement has been entered into and shall be governed in accordance
       with the laws of the State of New York, USA. The parties irrevocably and
       unconditionally submit to the jurisdiction of the courts of New York, NY,
       USA.

14     Notices

       All notices required or permitted under this Agreement will be in writing
       and will be deemed received when (a) delivered personally; (b) when sent
       by confirmed telex or facsimile (followed by the actual document in air
       mail/air courier); (c) three (3) days after having been sent by
       registered or certified mail, return receipt requested, portage prepaid
       (or ten (10) days for international mail); or (d) one (1) day alter
       deposit with a commercial express courier specifying next day delivery
       or, for international courier packages, two (2) days after deposit with a
       commercial express courier specifying 2-day delivery, with written
       verification of receipt, to the address set forth below:


<PAGE>


Purchase and Sale Agreement                                              Page 11


Purchaser:
Globaltron Communications Corporation
45 Broadway, Floor 12
New York, NY
USA

Vendor:
Tropico Sistemas e Telecomunicacoes S.A
Av. Selma Parada, 201 (Galleria Office Park, Ed 4)
Campinas-SP-Brasil

Singer:
Singer Products Inc.
1840 West 49th Street, Suite 501
Hialeah, FL 33012

15     Taxes

       All prices and charges stated herein are exclusive of any taxes, fees and
       duties or other amounts, however designated, and including without
       limitation value added and withholding taxes which are levied or based
       upon prices and charges or upon this Agreement outside of Brazil.
       Purchaser shall report and pay all federal, state, and local taxes,
       (excluding only those taxes based on the net income derived by Vendor and
       Singer), duties and amounts designated, levied, or based (1) upon the
       Product and the Purchase Price, or any other amounts payable under this
       Agreement; (2) on account of this Agreement; or (3) with respect to the
       Products, the Programs, or the acquisition, ownership, or use thereof by
       Purchaser. Purchaser shall indemnify and hold harmless Vendor and Singer,
       from all claims and liability resulting from Purchaser failure to report
       or pay such amounts.

16     Entire Agreement, Modifications.

       This Agreement including all exhibits hereto, which are hereby
       incorporated herein by this reference, constitutes the entire agreement
       between the parties hereto with respect to the subject matter hereof and
       supercedes any and all prior contemporaneous representations, proposals,
       agreements, negotiations, advertisements, statements, or understandings,
       whether oral or written. No amendment to this Agreement shall be binding
       on the Parties unless such amendment is in


<PAGE>
Purchase and Sale Agreement                                              Page 12



       writing and executed by authorized representatives of the Parties to this
       Agreement.

IN WITNESS WHEREOF, the Parties have caused this Agreement to be executed by
their respective authorized Representatives, in three identical counterparts,
each of which shall be deemed an original.
<TABLE>
<CAPTION>
<S>                                                   <C>
Global Communications Corporation                     By:  /s/ Gary Morgan
----------------------------------------                   ------------------------
Gary Morgan                                           Title: President


Tropico Sistemas e Telecomunicacoes S.A.              By:
----------------------------------------                  -------------------------
Luiz Augusto C. de Aquino                             Title: Director


Tropico Sistemas e Telecomunicacoes S.A.              By: /s/ Arnaldo Coutinho Costa
----------------------------------------                  --------------------------
Arnaldo Coutinho Costa                                Title: Business Director


Singer Products Inc.                                  By:
---------------------------------------                   --------------------------
Jaime Rojas                                           Title: Director

</TABLE>



<PAGE>




Purchase and Sale Agreement                                              Page 13




                                LIST OF EXHIBITS
                                ----------------



Exhibit A:        Quantity and Prices for Equipment and Vendor Services



Exhibit B:        Vendor Proposal to Globaltron Including Product Specifications



Exhibit C:        Finance Term Sheet



Exhibit D:        Project Schedule and Delivery Dates for Products



Exhibit E:        Training



Exhibit F:        Licensing Conditions for the Programs



<PAGE>
<TABLE>
<CAPTION>


                                   EXHIBIT - A

              QUANTITY AND PRICES FOR EQUIPMENT AND VENDOR SERVICES
----------------------------------------------------------------------------------------------------------------------
                                                       E1s QUANTITY
                                                       ------------
DEPLOY              SITES                        TOTAL        V 5.2            DESCRIPTION                EQ. PRICES
----------------------------------------------------------------------------------------------------------------------
<S>                                                <C>         <C>              <C>                       <C>
   1              Medellin                         80           -             Transit Switch              400,000.00
                  New York                         80           -             Transit Switch              400,000.00
                  Lima Peru                        40           -             Transit Switch              225,000.00
----------------------------------------------------------------------------------------------------------------------
               TOTAL DEPLOYMENT GROUP 1                                                                 1,025,000.00
----------------------------------------------------------------------------------------------------------------------
   2              Bogota                          113          47             Local Switch                430,000.00
                  Cali                             85          36             Local Switch                336,000.00
                  Cartagena                        28          12             Local Switch                124,000.00
----------------------------------------------------------------------------------------------------------------------
               TOTAL DEPLOYMENT GROUP 2                                                                   890,000.00
----------------------------------------------------------------------------------------------------------------------
   3              Medellin                         57          24             Local Switch                238,000.00
                  Barranquilla                     57          24             Local Switch                238,000.00
                  New York                        120           -             Transit Expansion           500,000.00
                  Medellin                         80           -             Transit Expansion           360,000.00
                  Lima Peru                        40           -             Transit Expansion           180,000.00
----------------------------------------------------------------------------------------------------------------------
               TOTAL DEPLOYMENT GROUP 3                                                                 1,516,000.00
----------------------------------------------------------------------------------------------------------------------
                  New York                        130           -             Transit Expansion           515,000.00
                  Bogota                           97          40             Local Expansion             388,000.00
                  Cali                             80          33             Local Expansion             284,000.00
                  Cartagena                        25          12             Local Expansion             102,000.00
                  Bucaramanga                      28          12             Local Switch                124,000.00
                  Pereira                          28          12             Local Switch                124,000.00
                  Cucuta                           28          12             Local Switch                124,000.00
                  Villavicencio                    28          12             Local Switch                124,000.00
                  Santa Marta                      28          12             Local Switch                124,000.00
----------------------------------------------------------------------------------------------------------------------
               TOTAL DEPLOYMENT GROUP 4                                                                 1,909,000.00
----------------------------------------------------------------------------------------------------------------------
          TOTAL AMOUNT - FOR MANAUS (Brasil)  US$                                                       5,340,000.00
----------------------------------------------------------------------------------------------------------------------
</TABLE>
Note:  The number E1's include: V5.2 interface, routings, MSA, Value added
services and VoIP trunks.

The prices include factory services.


<PAGE>
<TABLE>
<CAPTION>

                        SINGER PRODUCTS INC. & CIA. LTDA
------------------------------------------------------------------------------------------------------------------------------------
Cra. 9A No. 91 - 27 Bogota, D.C. Colombia
Conmutador: 610 3400 SPC- Fax: 218 6640
A.A. No. 54902   cables "COREGNIS"
------------------------------------------------------------------------------------------------------------------------------------
<S>                          <C>                        <C>        <C>     <C>        <C>         <C>
REMISION No.                TRABAJO NO.                           FECHA               PAGINA
                                                        MES       DIA      ANO          DE

                                                         07         31     2000      1      1
------------------------------------------------------------------------------------------------------------------------------------
                                                        FACTURA CAMBIARIA
                                                        DE COMPRA VENTA         15968
------------------------------------------------------------------------------------------------------------------------------------
                                                        NIT 860 031 240 4                         Facluracion Autorizada por la
                                                        IVA REGIMEN COMUN                         DIAN Segun Resolucion No.
                                                        NO Somos agenles relenedores del IVA      300000071315 de 1998/08/12
                                                        Condigo Actividad ICA                     Numeracion de 15101 al 16100
                                                        204 Ventas 0.8%
                                                        304 Servicios 0.7%
------------------------------------------------------------------------------------------------------------------------------------
PEDIDO DEL CLIENTE No.                FECHA PEDIDO REFERENCIA SPC No.                             GRUPO

Contract Dated   7-11-00
------------------------------------------------------------------------------------------------------------------------------------
VENDIDO A: Globaltron Communications Corporations                         DESPACHADO A: Mrs. Arlene Margolis
           New World Tower, 100 North Biscayne Boulevard,                 Administration Vice president
           Suite 2500
           Miami, FL
CONDICIONES DE PAGO
     Payment terms
     ten (10) days of Invoice presentation
------------------------------------------------------------------------------------------------------------------------------------
IDENTIFICATION DEL CLIENTE                                            MARCAS:
------------------------------------------------------------------------------------------------------------------------------------
DESPACHADO VIA:          FECHA DE DESPACHO        DESPACHADO DE       REFERENCIA DE DESPACHO No.         ASEGURADO POR.
------------------------------------------------------------------------------------------------------------------------------------
ITEM    CANTDAD                                    DESCRIPCION                          PRECIO UNITARIO                 TOTAL
------------------------------------------------------------------------------------------------------------------------------------
  1        -             First Payment of telephony switches services
                         item 1 of services agreement                                             UDS                173.600.00


  2        -             First payment of software systems services,                              USD                118,900.00
                         item 2 of services agreement


------------------------------------------------------------------------------------------------------------------------------------
SON:    Three hundred thirty six thousand three hundred and seventy five dollars with 00/00     SUB-TOTAL        $   292,500.00
------------------------------------------------------------------------------------------------------------------------------------
Esta factura se asimila en todos sus einclos legales a la letra de cambio Articulo 774 del          IVA
Codigo de Comercio                                                                              USD_____%             43.875.00
------------------------------------------------------------------------------------------------------------------------------------
RECIBI CONFORME                                          REVISADO POR


                                   FIRMA SELLO
------------------------------------------------------------------------------------------------------------------------------------
FECHA      NOMBRE:                                                                              TOTAL $USD           336.375.00
------------------------------------------------------------------------------------------------------------------------------------
</TABLE>