NCT GROUP INC
S-1/A, EX-10, 2000-10-25
MISCELLANEOUS ELECTRICAL MACHINERY, EQUIPMENT & SUPPLIES
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Exhibit 10(am)

                      SECURITIES PURCHASE AND SUPPLEMENTAL
                            EXCHANGE RIGHTS AGREEMENT

     SECURITIES  PURCHASE  AND  SUPPLEMENTAL   EXCHANGE  RIGHTS  AGREEMENT  (the
"Agreement"),   dated  as  of   September   29,  2000  by  and  among  Pro  Tech
Communications,  Inc., a Florida Corporation,  with headquarters located at 3311
Industrial  25th Street,  Fort Pierce,  Florida 34946 ("Pro  Tech"),  NCT Group,
Inc., a Delaware  corporation,  with  headquarters  located at 1025 West Nursery
Road,  Suite  120,  Linthicum,  Maryland  21090  ("NCT"),  Balmore  Funds,  S.A.
("Balmore"),  Austost Anstalt Schaan  ("Austost") and Zakeni Limited  ("Zakeni",
"Balmore" and "Austost" are referred to herein  collectively as the "Buyers" and
individually as the "Buyer").

     WHEREAS,  Pro Tech,  NCT and the Buyers are executing and  delivering  this
Agreement in reliance upon the exemption from securities  registration  pursuant
to Section 4(2) and/or  Regulation D ("Regulation D") as promulgated by the U.S.
Securities and Exchange Commission (the "SEC") under the Securities Act of 1933,
as amended (the "1933 Act");

     WHEREAS, Pro Tech has authorized a new series of Preferred Stock, par value
$0.01 per share (the  "Preferred  Stock"),  designated  the Series A Convertible
Preferred Stock (the "Series A Preferred  Shares") with a stated value of $1,000
per share  ("Stated  Value") and an accretion rate of 4% per annum on the Stated
Value ("4%  Accretion"),  which shall be  convertible  into shares of Pro Tech's
common stock, $0.001 par value per share (the "Common Stock") (as converted, the
"Conversion  Shares"),  in accordance  with the terms of Pro Tech's  Articles of
Amendment  to  Articles of  Incorporation  dated as of  September  29, 2000 (the
"Articles of Amendment"), to be filed by Pro Tech with the Secretary of State of
the  State  of  Florida  on  or  prior  to  the  Closing  (as  defined   herein)
substantially in the form attached hereto as Exhibit "A";

     WHEREAS,  Pro Tech shall issue Warrants (as defined below) to Buyers on the
Closing Date to purchase shares of Common Stock ("Warrant Shares") as additional
consideration to induce Buyers to enter into this Agreement;

     WHEREAS,  the Buyers desire to purchase from Pro Tech, and Pro Tech desires
to issue and sell to the Buyers,  upon the terms and  conditions  stated in this
Agreement,  an aggregate  amount of 1,500 shares of Series A Preferred  Stock in
the  respective  amounts set forth opposite each Buyer's name on the Schedule of
Buyers attached hereto;

     WHEREAS,  NCT is granting the Buyers  supplemental  exchange rights whereby
the Buyers may, in accordance  with and subject to the terms of this  Securities
Purchase  Agreement,  exchange  Series A  Preferred  Shares  for shares of NCT's
common stock,  $0.01 par value per share (the "NCT Common Stock") (as exchanged,
the "Exchange Shares"); and

     WHEREAS,   contemporaneously  with  the  execution  and  delivery  of  this
Agreement,  (1)  Pro  Tech  and  the  Buyers  are  executing  and  delivering  a
Registration  Rights  Agreement  substantially  in the form  attached  hereto as
Exhibit "B" (the "Pro Tech Registration Rights Agreement") pursuant to which Pro
Tech has agreed to provide  certain  registration  rights under the 1933 Act and
the  rules  and  regulations  promulgated   thereunder,   and  applicable  state
securities  laws,  and (2) NCT and the Buyers are  executing  and  delivering  a
Registrations  Rights Agreement  substantially in the form hereto as Exhibit "C"
(the "NCT Registration  Rights Agreement")  pursuant to which NCT has agreed, as
the case may arise,  to provide certain  registration  rights under the 1933 Act
and the rules and  regulations  promulgated  thereunder,  and  applicable  state
securities laws.

     NOW  THEREFORE,  in  consideration  of the  premises  hereof and the mutual
covenants,  representations  and warranties  contained herein, Pro Tech, NCT and
the Buyers hereby agree as follows:

     1.   PURCHASE AND SALE OF SERIES A PREFERRED SHARES.

     a.   Purchase of Series A Preferred Shares. Subject to the satisfaction (or
          waiver) of the  conditions  precedent to Closing (as defined below) as
          set forth in  Sections  9, 10 and 11 below,  on the  Closing  Date (as
          defined below),  Pro Tech shall issue and sell to the Buyers,  and the
          Buyers shall  purchase  from Pro Tech,  an  aggregate  amount of 1,500
          shares of Series A Preferred Shares, in consideration for an aggregate
          of $1,500,000  cash (the "Purchase  Price") in the respective  amounts
          set forth opposite each Buyer's name on the Schedule of Buyers.

     b.   Closing Date.  The date and time of the closing (the  "Closing  Date")
          shall be 10:00 a.m.  Eastern  Daylight  Savings Time,  within five (5)
          business days following the date hereof,  subject to  notification  of
          satisfaction  (or waiver) of the  conditions  precedent to Closing set
          forth  herein (or such later date as is mutually  agreed to in writing
          by Pro Tech, NCT and the Buyers).  The closing (the  "Closing")  shall
          occur on the Closing  Date at the offices of Steel Hector & Davis LLP,
          located at 200 South Biscayne Blvd., 41st Floor, Miami, Florida 33131.

     c.   Form of  Payment.  On the Closing  Date,  (i) each Buyer shall pay the
          Purchase Price for the Series A Preferred Shares to be issued and sold
          to such  Buyer  at the  Closing,  in  United  States  dollars  by wire
          transfer of immediately  available  funds to an account  designated in
          writing by Pro Tech for such  purpose.  Pro Tech shall  deliver  share
          certificates  representing such Series A Preferred Shares,  which such
          Buyer is then  purchasing (as indicated  opposite such Buyer's name on
          the  Schedule  of  Buyers),  duly  executed  on behalf of Pro Tech and
          registered  in the name of such Buyer or its  designee  (the "Series A
          Certificates").

     2.   WARRANTS.

     a.   Pro Tech  will  issue to  Balmore  Funds,  S.A.  a  warrant  ("Balmore
          Warrant") to purchase  1,500,000 shares of Common Stock at an exercise
          price of $0.50 per share, substantially in the form attached hereto as
          Exhibit "D" ("Balmore Warrant Agreement").

     b.   Pro Tech will  issue to  Austost  Anstalt  Schaan a warrant  ("Austost
          Warrant" ) to purchase 1,500,000 shares of Common Stock at an exercise
          price of $0.50 per share, substantially in the form attached hereto as
          Exhibit "E" ("Austost Warrant Agreement").

     c.   Pro Tech will issue to Zakeni Limited a warrant ("Zakeni  Warrant" and
          together  with  the  Balmore  Warrant  and the  Austost  Warrant,  the
          "Warrants") to purchase 1,500,00 shares of Common Stock at an exercise
          price of $0.50 per share, substantially in the form attached hereto as
          Exhibit "F" ("Zakeni Warrant  Agreement" and together with the Balmore
          Warrant  Agreement  and the Austost  Warrant  Agreement,  the "Warrant
          Agreements").

     3.   BUYER'S  SUPPLEMENTAL RIGHTS TO EXCHANGE SERIES A PREFERRED SHARES FOR
          NCT COMMON STOCK

     Any Buyer of  Series A  Preferred  Shares  shall be  entitled,  at its sole
election and in lieu of a Buyer's conversion rights provided for in the Articles
of Amendment,  to exchange  shares of Series A Preferred Stock for shares of NCT
Common Stock on the following terms and conditions:

     a.   Exchange  Rights.  At any time on or after  six (6)  months  after the
          Issuance Date (as defined below), a Buyer of Series A Preferred Shares
          shall have the right,  at such Buyer's  option,  to exchange up to and
          including  fifty percent  (50%) of such Series A Preferred  Shares for
          fully  paid  and  nonassessable  shares  of NCT  Common  Stock  at the
          Exchange Rate (as defined below). Furthermore, at any time on or after
          twelve (12) months after the Issuance Date (as defined below), a Buyer
          of  Series A  Preferred  Shares  shall  also have the  right,  at such
          Buyer's  option,  to exchange up to and including one hundred  percent
          (100%)  of  such  Series  A  Preferred   Shares  for  fully  paid  and
          nonassessable  shares of NCT  Common  Stock at the  Exchange  Rate (as
          defined below).

     b.   Exchange  Rate. The number of shares of NCT Common Stock issuable upon
          exchange  of each of the Series A  Preferred  Shares  pursuant to this
          Section 3 shall be determined  according to the following formula (the
          "Exchange Rate"):

                     Face Value = Number of Shares of
                                  Exchange Price NCT Common Stock

          provided  that NCT  shall  have  the  option  to pay the 4%  Accretion
          accrued  on each  Series  A  Preferred  Share in  either  cash or cash
          equivalents.  If NCT elects to pay the 4% Accretion accrued in cash or
          cash equivalents, the Exchange Rate shall be:

                      Stated Value = Number of Shares of
                                     Exchange Price NCT Common Stock

     For  purposes  of this  Agreement,  the  following  terms  shall  have  the
following meanings:

               (i) "Face  Value"  equals the Stated  Value plus the 4% Accretion
               accrued on each share of Series A Preferred Stock;

               (ii)  "Exchange  Price" means the amount  obtained by multiplying
               0.8 by the lowest  average of the  average  Closing Bid Price (as
               defined below) for the NCT Common Stock for any consecutive  five
               (5) day  trading  period out of the  fifteen  (15)  trading  days
               preceding such relevant date;

               (iii) "Closing Bid Price" means, for any security as of any date,
               the last closing bid price on the Nasdaq  National  Market System
               (the  "Nasdaq-NM")  as reported by  Bloomberg  Financial  Markets
               ("Bloomberg"),  or, if the Nasdaq-NM is not the principal trading
               market  for such  security,  the last  closing  bid price of such
               security on the principal  securities  exchange or trading market
               where such security is listed or traded as reported by Bloomberg,
               or if the  foregoing do not apply,  the last closing bid price of
               such security in the  over-the-counter  market on the pink sheets
               or bulletin board for such security as reported by Bloomberg, or,
               if no  closing  bid  price  is  reported  for  such  security  by
               Bloomberg,  the last  closing  trade  price of such  security  as
               reported  by  Bloomberg.  If the  Closing  Bid  Price  cannot  be
               calculated for such security on such date on any of the foregoing
               bases,  the Closing Bid Price of such security on such date shall
               be the fair market value as  reasonably  determined in good faith
               by the Board of Directors  of the issuer of the security  (all as
               appropriately  adjusted  for any stock  dividend,  stock split or
               other similar transaction during such period); and

               (iv) "Issuance Date" means the Closing Date.

     c.   Buyer's Delivery  Requirements.  To exchange Series A Preferred Shares
          into full  shares  of NCT  Common  Stock on any date  (such  date,  an
          "Exchange  Date")  in  accordance  with and  subject  to the terms and
          conditions  set forth in Section 3(a) hereof,  the Buyer thereof shall
          (A) deliver or transmit by facsimile, for receipt on or prior to 11:59
          p.m., Eastern Time, on such date, a copy of a fully executed notice of
          exchange in the form  attached  hereto as Exhibit "G" (the  "Notice of
          Exchange") to NCT (c/o Cy Hammond, NCT Group, Inc., 20 Ketchum Street,
          Westport,  Connecticut 06880, facsimile number (203) 226-4338,  with a
          copy to Pro Tech at the address given in Section 14(g) herein, and (B)
          surrender  to a  common  carrier  for  delivery  to  NCT  as  soon  as
          practicable   following   such  notice,   the  original   certificates
          representing the Series A Preferred Shares, duly endorsed for transfer
          or accompanied by a duly executed  assignment,  being exchanged (or an
          indemnification  undertaking with respect to such  certificates in the
          case of  their  loss,  theft or  destruction)  (the  "Preferred  Stock
          Certificates") and the originally executed Notice of Exchange.

     d.   NCT Response.  Upon receipt by NCT of a facsimile  copy of a Notice of
          Exchange, NCT shall immediately send, via facsimile, a confirmation of
          receipt of such  Notice of Exchange  to such Buyer  ("Confirmation  of
          Receipt").  Upon receipt by NCT of the Preferred Stock Certificates to
          be  exchanged  pursuant  to a Notice of  Exchange,  together  with the
          originally  executed Notice of Exchange (such date,  "NCT's Receipt"),
          NCT or NCT's Transfer  Agent (as  applicable)  shall,  within five (5)
          business days following NCT's Receipt, issue and surrender to a common
          carrier for  overnight  delivery to the  address as  specified  in the
          Notice of Exchange, a certificate,  duly executed on behalf of NCT and
          registered in the name of the Buyer or its designee, for the number of
          shares of NCT Common Stock (the "Exchange  Shares") to which the Buyer
          shall be entitled.

     e.   Record Holder.  The person or persons entitled to receive the Exchange
          Shares  shall be treated  for all  purposes  as the  record  holder or
          holders of such shares of NCT Common Stock on the Exchange  Date.  NCT
          shall be treated by Pro Tech for all purposes as the record  holder of
          such shares of Series A Preferred Shares on the Exchange Date, and Pro
          Tech shall amend its records to so reflect.

     f.   NCT's  Failure  to Timely  Exchange.  If NCT shall  fail to issue to a
          Buyer  within seven (7)  business  days  following  NCT's  Receipt,  a
          certificate  for  the  Exchange  Shares,  in  addition  to  all  other
          available  remedies  which such Buyer may  pursue  hereunder,  (i) NCT
          shall  pay  additional  damages  to such  Buyer on each day  after the
          seventh  (7th)  business day  following  NCT's  Receipt  until the day
          delivery is effected or a Redemption  (as defined below) has occurred,
          an amount  equal to 1.0% of the product of (A) the number of shares of
          NCT  Common  Stock not  issued to the Buyer and to which such Buyer is
          entitled and (B) the Closing Bid Price (the "Redemption Price") of the
          NCT Common Stock on the business day following NCT's Receipt, and (ii)
          with respect to the unexchanged  shares of Series A Preferred Stock, a
          Buyer shall have the right, in its sole discretion,  to require NCT to
          redeem for cash from such Buyer those  Series A  Preferred  Shares for
          which NCT has failed to issue Exchange  Shares in accordance with such
          Buyer's Notice of Exchange (a "Redemption"),  at the Redemption Price.
          The parties  agree (i) that the timely  exchange of Series A Preferred
          Shares for Exchange  Shares is a material  element of this  Agreement,
          (ii) that the Buyers will suffer  damages  which may be  difficult  to
          quantify if NCT fails, for any reason,  to timely deliver the Exchange
          Shares,  and (iii) that any amount paid under this subsection shall be
          paid as liquidated damages and not as a penalty.

     4.   BUYER'S REPRESENTATIONS AND WARRANTEES.

     Each Buyer,  with  respect to only itself,  represents  and warrants to Pro
Tech and NCT that:

     a.   Investment Purpose. Such Buyer is acquiring (A) the Series A Preferred
          Shares, and (i) upon conversion of the Series A Preferred Shares, will
          acquire the Conversion  Shares then issuable or (ii) upon any exchange
          of the Series A Preferred  Shares,  will acquire the  Exchange  Shares
          then  issuable  and  (B)  the  Warrants,  pursuant  to the  terms  and
          conditions  of  the  Warrant  Agreements,  and  upon  exercise  of the
          Warrants,  will  acquire  Warrant  Shares,  for  its own  account  for
          investment purposes only and not with a view towards, or for resale in
          connection  with,  the public  sale or  distribution  thereof,  except
          pursuant to sales registered or exempted under the 1933 Act; provided,
          however,  that by making the  representations  herein, such Buyer does
          not agree to hold any Series A Preferred  Shares,  Conversion  Shares,
          Exchange  Shares,  Warrants or Warrant Shares for any minimum or other
          specific  term and reserves the right to dispose of Series A Preferred
          Shares, Conversion Shares, Exchange Shares, Warrants or Warrant Shares
          at  any  time  in   accordance   with  or  pursuant  to  an  effective
          registration  statement  under  the  1933 Act and in  compliance  with
          applicable   state   securities   laws  or  an  exemption   from  such
          registration.

     b.   Accredited Investor Status. Such Buyer is an "accredited  investor" as
          that term is defined in Rule  501(a)(3) of Regulation D. As such,  the
          Buyer is able to bear the economic risk of an investment in the Series
          A Preferred  Shares and,  as of the date  hereof,  is able to afford a
          total and complete loss of its investment.

     c.   Sophisticated  Investors.  Such  Buyer has such  knowledge,  skill and
          experience in business, financial and investment matters so that it is
          capable of  evaluating  the merits  and risk of an  investment  in the
          Series A Preferred Shares,  the Conversion Shares, the Exchange Shares
          and the Warrant Shares and, to the extent necessary,  has retained, at
          its own  expense,  and relied  upon  appropriate  professional  advice
          regarding the  investment,  tax and legal merits and  consequences  of
          such  Buyer's  investments  in the  Series  A  Preferred  Shares,  the
          Conversion Shares, the Exchange Shares and the Warrant Shares.

     d.   Reliance on Exemptions.  Such Buyer  understands and acknowledges that
          the Series A Preferred  Shares,  the Conversion  Shares,  the Exchange
          Shares, the Warrants and the Warrant Shares are being offered and sold
          to it in a private  placement in reliance on specific  exemptions from
          the  registration  requirements  of United  States  federal  and state
          securities laws and that Pro Tech and NCT are relying in part upon the
          truth  and  accuracy  of,  and  such  Buyer's   compliance  with,  the
          representations,    warranties,   agreements,    acknowledgments   and
          understandings  of such Buyer set forth  herein in order to  determine
          the  availability of such exemptions and the eligibility of such Buyer
          to acquire such securities.

     e.   Information.  Such Buyer and its advisors, if any, have been furnished
          with all materials  relating to the business,  finances and operations
          of Pro Tech and NCT and  materials  relating  to the offer and sale of
          the Series A Preferred  Shares,  the Conversion  Shares,  the Exchange
          Shares,  the Warrants and the Warrant Shares which have been requested
          by such Buyer. Such Buyer and its advisors, if any, have been afforded
          the  opportunity  to ask  questions of Pro Tech and NCT.  Neither such
          inquiries nor any other due diligence  investigations conducted by the
          Buyer or its advisors,  if any, or their representatives shall modify,
          amend  or   affect   the   Buyer's   right  to  rely  on  Pro   Tech's
          representations  and warranties  contained in Section 5 below or NCT's
          representations  and  warranties  contained  in Section 6 below.  Such
          Buyer  understands  that its  investment  in the  Series  A  Preferred
          Shares,  the Conversion  Shares, the Exchange Shares, the Warrants and
          the  Warrant  Shares  involves a high  degree of risk.  Such Buyer has
          sought  such  accounting,  legal and tax  advice as it has  considered
          necessary to make an informed  investment decision with respect to its
          acquisition of the Series A Preferred Shares,  the Conversion  Shares,
          the Exchange Shares, the Warrants and the Warrant Shares.

     f.   No Governmental  Review.  Such Buyer understands that no United States
          federal or state agency or any other government or governmental agency
          has passed on or made any  recommendation or endorsement of the Series
          A Preferred Shares,  the Conversion  Shares,  the Exchange Shares, the
          Warrants or the Warrant Shares,  or the fairness or suitability of the
          investment in the Series A Preferred  Shares,  the Conversion  Shares,
          the Exchange Shares, the Warrants or the Warrant Shares, nor have such
          authorities  passed upon or endorsed the merits of the offering of the
          Series A Preferred Shares, the Conversion Shares, the Exchange Shares,
          the Warrants or the Warrant Shares.

     g.   No Broker  Commissions  or Finder Fees. To the best of its  knowledge,
          such Buyer has taken no action  which  would give rise to any claim by
          any  person  for  brokerage  commissions,  finders'  fees or the  like
          relating to this Agreement or the transactions contemplated hereby.

     h.   Buyer  Liquidity.  Such Buyer has adequate  means of providing for its
          current needs and foreseeable financial contingencies.

     i.   Transfer or Resale of Series A Preferred  Shares,  Conversion  Shares,
          Warrants and Warrant  Shares.  Such Buyer  understands  that except as
          provided in the Pro Tech Registration Rights Agreement: (i) the Series
          A Preferred  Shares,  the  Conversion  Shares,  the  Warrants  and the
          Warrant  Shares have not been and are not being  registered  under the
          1933 Act or any state  securities  laws,  and may not be  offered  for
          sale,  sold,  assigned,  transferred or otherwise  disposed of by such
          Buyer unless (a) subsequently  registered under the 1933 Act and state
          securities laws, if applicable, (b) such Buyer shall have delivered to
          Pro Tech an  opinion  of  counsel,  in form and  substance  reasonably
          satisfactory  to Pro Tech,  to the effect that such  securities  to be
          sold,  assigned,  transferred  or  otherwise  disposed of may be sold,
          assigned,   transferred  or  otherwise  disposed  of  pursuant  to  an
          exemption  from such  registration,  (c) such Buyer  provides Pro Tech
          with written  customary  assurance  that such  securities can be sold,
          assigned,  transferred  or otherwise  disposed of pursuant to Rule 144
          promulgated  under the 1933 Act (or a successor  rule thereto)  ("Rule
          144"), or (d) such Buyer  exchanges the Series A Preferred  Shares for
          Exchange  Shares  pursuant  to Section 3 above;  (ii) any sale of such
          securities made in reliance on Rule 144 may be made only in accordance
          with the terms of Rule 144 and further, if Rule 144 is not applicable,
          any resale of such securities under  circumstances in which the seller
          (or the person  through  whom the sale is made) may be deemed to be an
          underwriter  (as that term is  defined  in the 1933  Act) may  require
          compliance  with some other  exemption under the 1933 Act or the rules
          and regulations of the SEC thereunder;  and (iii) neither Pro Tech nor
          any other person is under any  obligation to register such  securities
          under the 1933 Act or any state securities laws, if applicable,  or to
          comply  with the terms and  conditions  of any  exemption  thereunder.
          Notwithstanding  the  registration  or  qualification  of the Series A
          Preferred Stock, the Conversion  Shares,  the Warrants and the Warrant
          Shares of such Buyer in  accordance  with Section  4(i)(i)(a)  through
          Section 4(i)(i)(d), such Buyer agrees not to knowingly sell, transfer,
          assign,  pledge,  exchange,  hypothecate or otherwise  dispose of such
          Series A Preferred Stock, the Conversion  Shares, the Warrants and the
          Warrant Shares and any registration rights thereto to a Competitor (as
          defined in Section  12(b) hereof ) of Pro Tech or its  affiliates  (as
          defined in Rule 501 of Regulation D of the 1933 Act) ("Affiliates").

     j.   Transfer or Resale of Exchange  Shares.  Such Buyer  understands  that
          except as provided in the NCT Registration  Rights Agreement:  (i) the
          Exchange Shares have not been and are not being  registered  under the
          1933 Act or any state  securities  laws,  and may not be  offered  for
          sale,  sold,  assigned,  transferred or otherwise  disposed of by such
          Buyer unless (a) subsequently  registered under the 1933 Act and state
          securities laws, if applicable, (b) such Buyer shall have delivered to
          NCT  an  opinion  of  counsel,   in  form  and  substance   reasonably
          satisfactory  to NCT, to the effect that such  securities  to be sold,
          assigned,  transferred or otherwise disposed of may be sold, assigned,
          transferred  or otherwise  disposed of pursuant to an  exemption  from
          such  registration,  or (c) such Buyer provides NCT written  customary
          assurance that such securities can be sold,  assigned,  transferred or
          otherwise  disposed  of  pursuant  to Rule 144;  (ii) any sale of such
          securities made in reliance on Rule 144 may be made only in accordance
          with the terms of Rule 144 and further, if Rule 144 is not applicable,
          any resale of such securities under  circumstances in which the seller
          (or the person  through  whom the sale is made) may be deemed to be an
          underwriter  (as that term is  defined  in the 1933  Act) may  require
          compliance  with some other  exemption under the 1933 Act or the rules
          and regulations of the SEC  thereunder;  and (iii) neither NCT nor any
          other person is under any obligation to register such securities under
          the 1933 Act or any state securities laws, if applicable, or to comply
          with the terms and conditions of any exemption thereunder.

     k.   Legends on Series A Preferred Shares,  Conversion Shares, Warrants and
          Warrant Shares.  Such Buyer understands that the certificates or other
          instruments  representing (A) the Series A Preferred Shares and, until
          such time as the sale of the  Conversion  Shares have been  registered
          under the 1933 Act as contemplated by the Pro Tech Registration Rights
          Agreement,  the stock certificates  representing the Conversion Shares
          and (B) the Warrants  and,  until such time as the sale of the Warrant
          Shares have been registered  under the 1933 Act as contemplated by the
          ProTech   Registration   Rights  Agreement,   the  stock  certificates
          representing  the Warrant Shares,  shall bear a restrictive  legend in
          substantially  the following  form (and a stop  transfer  order may be
          placed against transfer of such stock certificates):

               THE  SECURITIES  REPRESENTED  BY THIS  CERTIFICATE  HAVE NOT BEEN
               REGISTERED  UNDER THE  SECURITIES  ACT OF 1933,  AS  AMENDED,  OR
               APPLICABLE  STATE  SECURITIES  LAWS.  THE  SECURITIES  HAVE  BEEN
               ACQUIRED FOR INVESTMENT  PURPOSES ONLY AND MAY NOT BE OFFERED FOR
               SALE, SOLD, TRANSFERRED, ASSIGNED OR OTHERWISE DISPOSED OF IN THE
               ABSENCE OF AN EFFECTIVE REGISTRATION STATEMENT FOR THE SECURITIES
               UNDER THE  SECURITIES  ACT OF 1933,  AS AMENDED,  AND  APPLICABLE
               STATE  SECURITIES  LAWS,  OR AN OPINION OF COUNSEL,  IN CUSTOMARY
               FORM,  THAT  REGISTRATION  IS  NOT  REQUIRED  UNDER  SAID  ACT OR
               APPLICABLE  STATE SECURITIES LAWS OR UNLESS SOLD PURSUANT TO RULE
               144 UNDER SAID ACT.

          The legend set forth above shall be removed and Pro Tech shall issue a
          certificate or other  instrument  without such legend to the holder of
          the Series A Preferred Shares,  the Conversion Shares, and the Warrant
          Shares,  upon which it is stamped,  if, unless  otherwise  required by
          state securities  laws, (i) with respect to the Conversion  Shares and
          the Warrant  Shares  only,  the sale of the  Conversion  Shares or the
          Warrant Shares is registered under the 1933 Act, respectively, (ii) in
          connection with a sale transaction, such holder provides Pro Tech with
          an opinion of counsel, in form and substance reasonably  acceptable to
          Pro Tech,  to the effect that a public sale,  assignment,  transfer or
          other  disposition  of the Series A Preferred  Shares,  the Conversion
          Shares,  the  Warrants  and the  Warrant  Shares  may be made  without
          registration  under the 1933 Act,  or (iii) such holder  provides  Pro
          Tech with  written  customary  assurance  that the Series A  Preferred
          Shares, the Conversion Shares, the Warrants and the Warrant Shares can
          be sold pursuant to Rule 144.

     l.   Legends  on  Exchange   Shares.   Such  Buyer   understands  that  the
          certificates  or other  instruments  representing  the Exchange Shares
          and,  until  such time as the sale of the  Exchange  Shares  have been
          registered  under the 1933 Act as contemplated by the NCT Registration
          Rights  Agreement,  the stock  certificates  representing the Exchange
          Shares shall bear a restrictive  legend in substantially the following
          form (and a stop transfer order may be placed against transfer of such
          stock certificates):

               THE  SECURITIES  REPRESENTED  BY THIS  CERTIFICATE  HAVE NOT BEEN
               REGISTERED  UNDER THE  SECURITIES  ACT OF 1933,  AS  AMENDED,  OR
               APPLICABLE  STATE  SECURITIES  LAWS.  THE  SECURITIES  HAVE  BEEN
               ACQUIRED FOR INVESTMENT  PURPOSES ONLY AND MAY NOT BE OFFERED FOR
               SALE, SOLD, TRANSFERRED, ASSIGNED OR OTHERWISE DISPOSED OF IN THE
               ABSENCE OF AN EFFECTIVE REGISTRATION STATEMENT FOR THE SECURITIES
               UNDER THE  SECURITIES  ACT OF 1933,  AS AMENDED,  AND  APPLICABLE
               STATE  SECURITIES  LAWS,  OR AN OPINION OF COUNSEL,  IN CUSTOMARY
               FORM,  THAT  REGISTRATION  IS  NOT  REQUIRED  UNDER  SAID  ACT OR
               APPLICABLE  STATE SECURITIES LAWS OR UNLESS SOLD PURSUANT TO RULE
               144 UNDER SAID ACT.

          The legend set forth  above  shall be  removed  and NCT shall  issue a
          certificate  without such legend to the holder of the Exchange Shares,
          upon which it is  stamped,  if,  unless  otherwise  required  by state
          securities laws, (i) with respect to the Exchange Shares,  the sale of
          the  Exchange  Shares  is  registered  under  the  1933  Act,  (ii) in
          connection with a sale  transaction,  such holder provides NCT with an
          opinion of counsel,  in form and  substance  reasonably  acceptable to
          NCT, to the effect that a public sale,  assignment,  transfer or other
          disposition  of the Exchange  Shares may be made without  registration
          under the 1933 Act, or (iii) such  holder  provides  NCT with  written
          customary  assurance that the Exchange  Shares can be sold pursuant to
          Rule 144.

     m.   Powers; Authorization; Enforceability. Such Buyer has all corporate or
          company power and authority to enter into and perform this  Agreement.
          This  Agreement  has been duly and validly  authorized,  executed  and
          delivered on behalf of such Buyer and is a valid and binding agreement
          of such Buyer enforceable in accordance with its terms, except as such
          enforceability  may be  limited by  general  principles  of equity and
          bankruptcy,  insolvency,  reorganization,  moratorium, liquidation and
          other similar laws relating to, or affecting generally the enforcement
          of, applicable creditors' rights and remedies.

     n.   Conflicts.  Except as  disclosed  in  Schedule  4(n),  the  execution,
          delivery  and  performance  of this  Agreement  by such  Buyer and the
          consummation  by such Buyer of the  transactions  contemplated  hereby
          will not (i) conflict with or violate its  organizational  charters or
          by-laws, (ii) conflict with or constitute a default (or an event which
          with notice or lapse of time or both would become a default) under, or
          give to others any rights of termination,  amendment,  acceleration or
          cancellation of, any agreement,  indenture or instrument to which such
          Buyer is a party,  or (iii) to such  Buyer's  knowledge,  result  in a
          violation  of any law,  rule,  regulation,  order,  judgment or decree
          (including federal and state securities laws) applicable to such Buyer
          or any of its subsidiaries,  or by which any property or asset of such
          Buyer or any of its subsidiaries is bound or affected.

     5.   REPRESENTATIONS AND WARRANTIES OF PRO TECH.

     Pro Tech represents and warrants to each of the Buyers and NCT that:

     a.   Organization  and  Qualification.  Pro  Tech  is  a  corporation  duly
          organized and validly  existing in good standing under the laws of the
          state of Florida,  and has the requisite corporate power and authority
          to own and lease its  properties  (if any) and  assets and to carry on
          its business as now being  conducted.  Pro Tech is duly qualified as a
          foreign  corporation  to do business and is in good  standing in every
          jurisdiction in which the nature of the business conducted or property
          owned by it makes such qualification  necessary,  except to the extent
          that the failure to be so qualified or be in good  standing  would not
          have  a  material   adverse   effect  on  the  business,   operations,
          properties,  financial condition or results of operations of Pro Tech.
          As of the date hereof,  Pro Tech has no Subsidiaries.  For purposes of
          this Agreement,  "Subsidiaries"  or "Subsidiary" of a person or entity
          shall mean any corporation,  partnership,  limited liability  company,
          association or other  business  entity at least fifty percent (50%) of
          the  outstanding  voting  power  of  which  is at the  time  owned  or
          controlled  directly or  indirectly by such person or entity or by one
          or more of such subsidiary entities, or both.

     b.   Authorization,  Enforcement,  Compliance with Other  Instruments.  Pro
          Tech has the requisite corporate power and authority to enter into and
          perform this Agreement, the Pro Tech Registration Rights Agreement and
          any related agreements  (collectively,  the "Transaction  Documents"),
          and to issue the Series A Preferred Shares, the Conversion Shares, the
          Warrants and the Warrant Shares in accordance  with and subject to the
          terms and  conditions  hereof and  thereof.  The Articles of Amendment
          have been duly  authorized  by the Board of  Directors of Pro Tech and
          shall be filed with the  Secretary of State of the State of Florida on
          or prior to the Closing. The execution and delivery of the Transaction
          Documents by Pro Tech and the  consummation by it of the  transactions
          contemplated thereby,  including,  without limitation, the issuance of
          the Series A Preferred Shares and the Warrants and the reservation for
          issuance  and  subsequent  issuance of the  Conversion  Shares and the
          Warrant Shares issuable upon conversion or exercise thereof, have been
          duly  authorized  by Pro  Tech's  Board of  Directors  and no  further
          consent  or  authorization  is  required  by Pro  Tech,  its  Board of
          Directors or its  shareholders.  The  Transaction  Documents have been
          duly  executed  and  delivered  by  Pro  Tech  and,  when   delivered,
          constitute the valid and binding  obligations of Pro Tech  enforceable
          against  Pro Tech in  accordance  with  their  terms,  except  as such
          enforceability  may be  limited by  general  principles  of equity and
          applicable   bankruptcy,   insolvency,   reorganization,   moratorium,
          liquidation  or similar laws  relating to, or affecting  generally the
          enforcement  of,  creditors'  rights and remedies,  and subject to the
          limitation that the indemnification and contribution provisions of the
          Pro Tech  Registration  Rights  Agreement  may be  unenforceable  as a
          matter of public policy. On or prior to the Closing Date, the Articles
          of Amendment will be filed with the Secretary of State of the State of
          Florida and will be in full force and effect,  enforceable against Pro
          Tech in accordance with its terms.

     c.   Capitalization. As of the date hereof, the authorized capital stock of
          Pro Tech consists of  40,000,000  shares of Common Stock and 1,000,000
          shares  of  Preferred  Stock,  of  which  as of  September  14,  2000,
          4,266,000  shares of Common  Stock  were  issued and  outstanding  (as
          reflected in the Pro Tech's  Quarterly  Report on Form 10-QSB filed on
          September  14,  2000,  as amended)  and,  except for (i) that  certain
          Promissory  Note dated  March 27,  2000,  in the amount of One Hundred
          Fifty  Thousand  Dollars  ($150,000),  executed by Pro Tech payable to
          Westek  Communications  ("Westek Note"),  (ii) that certain Promissory
          Note dated June 6, 2000, in the amount of One Hundred Thousand Dollars
          ($100,000),  executed by Pro Tech payable to Balmore,  S.A.  ("Balmore
          Note"),  (iii) that certain Promissory Note dated June 7, 2000, in the
          amount of One Hundred  Thousand  Dollars  ($100,000),  executed by Pro
          Tech payable to Austost Anstalt Schaan ("Austost Note"), and (iv) that
          certain  Promissory  Note  dated  July  6,  2000,  in  the  amount  of
          Ninety-Nine  Thousand  Nine Hundred  Seventy-Five  Dollars  ($99,975),
          executed by Pro Tech payable to Zakeni  Limited  ("Zakeni  Note"),  no
          shares  of  preferred  stock,  debentures  or notes  were  issued  and
          outstanding.  All of such outstanding shares have been duly authorized
          and  validly  issued and are fully paid and  nonassessable.  Except as
          disclosed  in Schedule  5(c),  no shares of Common  Stock or Preferred
          Stock are  subject to  preemptive  or  similar  rights or any liens or
          encumbrances suffered or permitted by Pro Tech. Except as disclosed in
          Schedule 5(c), as of the effective date of this Agreement:

               (i) there are no outstanding options,  warrants, scrip, rights to
               subscribe to, calls or  commitments  of any character  whatsoever
               relating to, or securities or rights convertible into, any shares
               of  capital  stock  of  Pro  Tech,  or  contracts,   commitments,
               understandings or arrangements by which Pro Tech is or may become
               bound to issue additional shares of capital stock of Pro Tech;

               (ii) there are no outstanding debt securities; and

               (iii) there are no unperformed  agreements or arrangements  under
               which Pro Tech is  obligated to register the sale of any of their
               securities  under the 1933 Act (except the Pro Tech  Registration
               Rights Agreement).

          Pro Tech has  furnished  to each Buyer true and correct  copies of Pro
          Tech's Amended and Restated Articles of Incorporation,  as amended and
          as in effect on the date hereof (the "Articles of Incorporation"), and
          Pro Tech's Bylaws, as in effect on the date hereof (the "Bylaws").

     d.   Issuance  of  Securities.  The  Series  A  Preferred  Shares  are duly
          authorized  and, when issued and paid for in accordance with the terms
          hereof,  shall be (i) validly  issued,  fully paid and  nonassessable,
          (ii) free from all taxes, liens, encumbrances,  security interests and
          charges with respect to the issue  thereof,  and (iii) entitled to the
          rights and  preferences  set forth in the Articles of  Amendment.  The
          Conversion  Shares  issuable upon conversion of the Series A Preferred
          Shares  have been duly  authorized.  Upon  conversion  or  exercise in
          accordance with the Articles of Amendment,  the Conversion Shares will
          be validly issued, fully paid and nonassessable,  free from all taxes,
          liens,  encumbrances,  security  interests and charges with respect to
          the issue  thereof,  with the  holders  being  entitled  to all rights
          accorded to a holder of Common  Stock.  The  Warrants  and the Warrant
          Shares   issuable  upon  exercise  of  the  Warrants  have  been  duly
          authorized.  Upon  exercise  of the  Warrants in  accordance  with the
          Warrant Agreements,  the Warrant Shares will be validly issued,  fully
          paid and  nonassessable,  free from all  taxes,  liens,  encumbrances,
          security interests and charges with respect to the issue thereof, with
          the  holders  being  entitled  to all rights  accorded  to a holder of
          Common Stock.

     e.   No Conflicts.  Except as disclosed in Schedule  5(e),  the  execution,
          delivery  and  performance  of  this  Agreement  by Pro  Tech  and the
          consummation by Pro Tech of the transactions  contemplated hereby will
          not (i)  conflict  with or violate the  Articles of  Incorporation  or
          By-laws,  or (ii)  conflict  with or constitute a default (or an event
          which  with  notice or lapse of time or both  would  become a default)
          under,  or  give to  others  any  rights  of  termination,  amendment,
          acceleration   or  cancellation   of,  any  agreement,   indenture  or
          instrument  to which Pro Tech is a party,  which  conflict  or default
          would  have a material  adverse  effect on the  business,  operations,
          properties,  financial condition or results of operations of Pro Tech,
          or (iii) to Pro Tech's  knowledge,  result in a violation  of any law,
          rule,  regulation,  order,  judgment or decree (including  federal and
          state securities laws and regulations and the rules and regulations of
          the  principal  market or exchange on which the Common Stock is traded
          or listed)  applicable  to Pro Tech, or by which any property or asset
          of Pro Tech is bound or affected.

     f.   No Default or  Violation.  Except as disclosed in Schedule  5(f),  Pro
          Tech is not in  violation  of any  term  of or in  default  under  its
          Articles  of  Incorporation  or  By-laws,  or any  material  contract,
          agreement, mortgage,  indebtedness,  indenture,  instrument, judgment,
          decree or order or any statute,  rule or regulation  applicable to Pro
          Tech. To Pro Tech's  knowledge,  the business of Pro Tech is not being
          conducted,  and  shall  not be  conducted  in  violation  of any  law,
          ordinance or regulation of any governmental entity.

     g.   Consents. Except as specifically contemplated by this Agreement and as
          required under the 1933 Act and applicable  state securities laws, Pro
          Tech is not required to obtain any consent,  waiver,  authorization or
          order  of,  or make any  filing  or  registration  with,  any court or
          governmental  agency in  connection  with the  execution,  delivery or
          performance of any of its  obligations  under or  contemplated by this
          Agreement or the Pro Tech Registration  Rights Agreement in accordance
          with the terms hereof or thereof.  Except as disclosed in Section 7(f)
          and Schedule 5(g), all consents,  authorizations,  orders, filings and
          registrations  which Pro Tech is  required  to obtain  pursuant to the
          preceding  sentence  have been obtained or effected on or prior to the
          date hereof.

     h.   SEC Documents:  Financial Statements.  Since January 1, 1998, Pro Tech
          has timely filed all reports,  schedules,  forms, statements and other
          documents,  except for Pro Tech's last filed Quarterly  Report on Form
          10-QSB for the period ended July 31, 2000,  required to be filed by it
          with the SEC pursuant to the reporting  requirements of the Securities
          Exchange  Act of  1934,  as  amended  (the  "1934  Act")  (all  of the
          foregoing  materials  filed prior to the date hereof and all  exhibits
          included  therein and  financial  statements,  schedules and documents
          incorporated  by reference  therein,  being  hereinafter  collectively
          referred to as the "SEC  Documents").  Pro Tech has  delivered to each
          Buyer  or its  representative  true  and  complete  copies  of the SEC
          Documents.  As of their respective dates, the financial  statements of
          Pro Tech contained in the SEC Documents (the  "Financial  Statements")
          complied  as  to  form  in  all  material   respects  with  applicable
          accounting requirements and the published rules and regulations of the
          SEC with  respect  thereto  as in effect at the time of  filing.  Such
          Financial  Statements  have been  prepared in  accordance  with United
          States generally accepted accounting principles, consistently applied,
          during the periods involved (except (i) as may be otherwise  indicated
          in such Financial Statements or the notes thereto, or (ii) in the case
          of  unaudited  interim  statements,  to the  extent  they may  exclude
          footnotes  or may be  condensed  or  summary  statements)  and  fairly
          present in all material respects the financial position of Pro Tech as
          of the dates thereof and the results of its  operations and cash flows
          for  the  periods  then  ended  (subject,  in the  case  of  unaudited
          statements,   to  normal   year-end  audit   adjustments).   No  other
          information  provided  by or on behalf of Pro Tech to each Buyer which
          is not included in the SEC Documents,  including,  without limitation,
          information  referred to in Section 4(d) of this  Agreement,  contains
          any untrue statement of a material fact or omits to state any material
          fact necessary in order to make the statements  therein,  in the light
          of the circumstance under which they are or were made, not misleading.

     i.   Absence of Certain  Changes.  Except as  disclosed  in Schedule  5(i),
          since the date of the financial statements included in Pro Tech's last
          filed  Quarterly  Report on Form 10-QSB for the period  ended July 31,
          2000,  there  has been no  material  adverse  change  and no  material
          adverse development in the business, properties, operations, financial
          condition,  results of operations  or prospects of Pro Tech.  Pro Tech
          has not taken any  steps,  and does not  currently  expect to take any
          steps, to seek protection pursuant to any bankruptcy law, nor does Pro
          Tech have any knowledge or reason to believe that its creditors intend
          to initiate involuntary bankruptcy proceedings.

     j.   Absence of Litigation.  There is no action, suit, proceeding,  inquiry
          or  investigation  before or by any court,  public  board,  government
          agency, self-regulatory organization or body pending or, to Pro Tech's
          knowledge,  threatened  against  or  affecting  Pro Tech or the Common
          Stock  wherein an  unfavorable  decision,  ruling or finding would (i)
          have  a  material  adverse  effect  on the  transactions  contemplated
          hereby;  (ii) adversely affect the validity or  enforceability  of, or
          the authority or ability of Pro Tech to perform its obligations under,
          the Transaction  Documents;  or (iii) except as expressly set forth in
          Schedule  5(j),  reasonably  be  expected  to have a material  adverse
          effect on the business, operations, properties, financial condition or
          results of operation of Pro Tech.

     k.   Acknowledgment  Regarding  Buyer's  Purchase  of  Series  A  Preferred
          Shares.  Pro Tech  acknowledges  and agrees,  based upon each  Buyer's
          representations,  that each Buyer is acting  solely in the capacity of
          an  arms-length  purchaser  with  respect  to this  Agreement  and the
          transactions  contemplated  hereby. Pro Tech further acknowledges that
          each Buyer is not acting as a financial  advisor or  fiduciary  of Pro
          Tech (or in any similar  capacity)  with respect to this Agreement and
          the  transactions  contemplated  hereby and any  advice  given by each
          Buyer or any of its respective representatives or agents in connection
          with this Agreement and the transactions contemplated hereby is merely
          incidental to such Buyer's purchase of the Series A Preferred  Shares,
          the  Conversion  Shares  or  the  Warrant  Shares.  Pro  Tech  further
          represents  to each Buyer that Pro Tech's  decision to enter into this
          Agreement has been based solely on the  independent  evaluation by Pro
          Tech and its representatives.

     l.   No Undisclosed Events, Liabilities,  Developments or Circumstances. To
          Pro Tech's knowledge, no event, liability, development or circumstance
          has occurred or exists,  or is contemplated to occur,  with respect to
          Pro  Tech  or  its  business,  properties,  prospects,  operations  or
          financial  condition,  which could be material  but which has not been
          publicly announced or disclosed in writing to the Buyer.

     m.   No General Solicitation.  Neither Pro Tech, nor any of its Affiliates,
          nor any person  acting on its or their  behalf,  has  distributed  any
          offering  materials or engaged in any form of general  solicitation or
          general advertising (within the meaning of Regulation D under the 1933
          Act) in  connection  with the offer or sale of the Series A  Preferred
          Shares, the Conversion Shares, the Warrants or the Warrant Shares.

     n.   Employee Relations. Pro Tech is not involved in any labor dispute nor,
          to Pro Tech's  knowledge is any such dispute  threatened.  None of Pro
          Tech's employees is a member of a union and Pro Tech believes that its
          relations with its employees are satisfactory.

     o.   Environmental  Laws.  Pro Tech,  to Pro  Tech's  knowledge,  (i) is in
          compliance  with any and all applicable  foreign,  federal,  state and
          local laws and regulations  relating to the protection of human health
          and safety,  the  environment  or  hazardous  or toxic  substances  or
          wastes,  pollutants or contaminants  ("Environmental  Laws"); (ii) has
          received all permits, licenses or other approvals required of it under
          applicable Environmental Laws to conduct its business; and (iii) is in
          compliance  with all material terms and conditions of any such permit,
          license or approval.

     p.   Title. Pro Tech has good and marketable title to, or the right to use,
          all personal  property  owned or leased by it which is material to the
          business  of Pro  Tech,  in each  case  free and  clear of all  liens,
          encumbrances  and defects,  except as  described in Schedule  5(p) and
          except  for those  which do not  materially  affect  the value of such
          property  or  interfere  with the use made and  proposed to be made of
          such  property by Pro Tech.  Pro Tech does not own any real  property.
          Any real property and facilities held under lease by Pro Tech are held
          by it  under  valid,  subsisting  and  enforceable  leases  with  such
          exceptions as are not material and do not interfere  with the use made
          and proposed to be made of such property and buildings by Pro Tech .

     q.   Insurance. Pro Tech is insured by insurers which Pro Tech believes are
          of recognized financial  responsibility  against such losses and risks
          and in such amounts as  management  of Pro Tech believes to be prudent
          and customary in the businesses in which Pro Tech is engaged. Pro Tech
          has no  knowledge  that it will  not be able  to  renew  its  existing
          insurance coverage as and when such coverage expires or obtain similar
          coverage  from like  insurers  as may be  necessary  to  continue  its
          business at a cost that would not materially and adversely  affect the
          condition,  financial  or  otherwise,  or the  earnings,  business  or
          operations of Pro Tech.

     r.   Regulatory Permits.  Pro Tech, to Pro Tech's knowledge,  possesses all
          certificates,  authorizations,  licenses  and permits  required by the
          appropriate federal, state or foreign regulatory authorities necessary
          to  conduct  its   business,   except  where   failure  to  have  such
          certificates,  authorizations,  licenses  or permits  would not have a
          material adverse effect on the condition,  financial or otherwise,  or
          the  earnings,  business or  operations  of Pro Tech.  Pro Tech has no
          knowledge of, or has not received notice of,  proceedings  relating to
          the revocation or modification of any such certificate, authorization,
          license or permit.

     s.   Internal Accounting Controls.  Pro Tech maintains a system of internal
          accounting  controls  sufficient to provide reasonable  assurance that
          (i) transactions are executed in accordance with management's  general
          or  specific   authorizations,   (ii)  transactions  are  recorded  as
          necessary to permit preparation of financial  statements in conformity
          with generally  accepted  accounting  principles and to maintain asset
          accountability, (iii) access to assets is permitted only in accordance
          with  management's  general or  specific  authorization,  and (iv) the
          recorded  accountability  for  assets is  compared  with the  existing
          assets at reasonable  intervals and  appropriate  action is taken with
          respect to any differences.

     t.   No Materially Adverse  Contracts,  etc. Pro Tech is not subject to any
          charter,  corporate  or  other  legal  restriction,  or any  judgment,
          decree, order, rule or regulation which, in the judgment of Pro Tech's
          officers,  has or is  reasonably  expected  in the  future  to  have a
          material  adverse effect on the  businesses,  properties,  operations,
          financial  condition,  results of operations or prospects of Pro Tech.
          Pro Tech is not a party to any  contract or  agreement  which,  in the
          judgment of Pro Tech's officers, has or is reasonably expected to have
          a material adverse effect on the businesses,  properties,  operations,
          financial condition, results of operations or prospects of Pro Tech.

     u.   Tax Status. Except as set forth on Schedule 5(u), Pro Tech has made or
          filed all federal and state income and all other tax returns,  reports
          and  declarations  required by any jurisdiction to which it is subject
          (unless  and only to the  extent  that  Pro Tech has set  aside on its
          books provisions reasonably adequate for the payment of all unpaid and
          unreported  taxes)  and has  paid all  taxes  and  other  governmental
          assessments  and  charges  that  are  material  in  amount,  shown  or
          determined to be due on such returns, reports and declarations (except
          those  being  contested  in good faith) and has set aside on its books
          provisions  reasonably  adequate  for the  payment  of all  taxes  for
          periods  subsequent to the periods to which such  returns,  reports or
          declarations  apply.  There are no unpaid taxes in any material amount
          claimed to be due by the taxing authority of any jurisdiction, and the
          officers of Pro Tech have no  knowledge  of, and know of no basis for,
          any such claim.

     v.   Certain Transactions. Except as set forth on Schedule 5(v), in the SEC
          Documents  and  arms-length  transactions  pursuant  to which Pro Tech
          makes  payments in the ordinary  course of business upon terms no less
          favorable than Pro Tech could obtain from third parties and other than
          the grant of stock  options  disclosed on Schedule  5(c),  none of the
          officers,  directors, or employees of Pro Tech is presently a party to
          any  transaction  with Pro Tech (other than for services as employees,
          officers and  directors),  including any contract,  agreement or other
          arrangement  providing  for  the  furnishing  of  services  to or  by,
          providing  for  rental of real or  personal  property  to or from,  or
          otherwise requiring payments to or from any officer,  director or such
          employee or, to Pro Tech's  knowledge,  any corporation,  partnership,
          trust or other  entity in which  any  officer,  director,  or any such
          employee  has a  substantial  interest  or is  an  officer,  director,
          trustee or partner.

     w.   Dilutive Effect. Pro Tech understands and acknowledges that the number
          of Conversion  Shares and Warrant Shares  issuable upon  conversion of
          the  Series A  Preferred  Shares and  exercise  of the  Warrants  will
          increase in certain circumstances.  Pro Tech further acknowledges that
          its obligation to issue  Conversion  Shares upon the conversion of the
          Series A Preferred  Shares in accordance  with this  Agreement and the
          Articles of Amendment is absolute and unconditional  regardless of the
          dilutive effect that such issuance may have on the ownership interests
          of other shareholders of Pro Tech. Pro Tech further  acknowledges that
          its  obligation  to issue  Warrant  Shares  upon the  exercise  of the
          Warrants  in  accordance  with  this  Agreement  and the  Warrants  is
          absolute and unconditional regardless of the dilutive effect that such
          issuance may have on the ownership  interests of other stockholders of
          Pro Tech.

     x.   Fees and Rights of First  Refusal.  Pro Tech is not obligated to offer
          the securities  offered hereunder on a right of first refusal basis or
          similar  right to any third  parties  including,  but not  limited to,
          current or former  shareholders  of Pro Tech,  underwriters,  brokers,
          agents or other third parties.

     y.   Investment Company. Pro Tech is not, and is not controlled by or under
          common  control with an Affiliate of, an "investment  company"  within
          the meaning of the Investment Company of Act of 1940, as amended.

     z.   No Broker  Commissions  or Finder  Fees.  Pro Tech has taken no action
          which  would  give  rise to any  claim  by any  person  for  brokerage
          commissions,  finders' fees or the like relating to this  Agreement or
          the transactions contemplated hereby.

     aa.  Pro Tech's  Representations  and Warranties  Generally.  To Pro Tech's
          knowledge,  neither this Agreement nor the Schedules  attached  hereto
          furnished by or on behalf of Pro Tech contain any untrue  statement of
          a material fact or omit to state any material fact  necessary in order
          to make the statements made therein not misleading.

     bb.  Pro Tech's Knowledge Generally. Where any representation,  warranty or
          statement contained herein regarding a specific matter relating to Pro
          Tech or its  business  or affairs is  qualified  by the phrase "to Pro
          Tech's  knowledge" or any similar phrase  relating to the knowledge of
          Pro  Tech,  it is  intended  to  mean  the  actual  knowledge  of  any
          executive, manager or director of Pro Tech, and an individual shall be
          deemed to have "knowledge" of a particular fact, circumstance or other
          matter if: (a) such person is actually aware of such fact or matter or
          (b) a prudent  individual  would be expected to discover or  otherwise
          become aware of such fact,  circumstance or other matter in the course
          of conducting a reasonable  inquiry  concerning the truth or existence
          of such fact, circumstance, or other matter.

     6.   REPRESENTATIONS AND WARRANTIES OF NCT

     NCT represents and warrants to each of the Buyers that:

     a.   Organization  and  Qualification.  NCT is a corporation duly organized
          and validly  existing in good standing  under the laws of the state of
          Delaware,  and has the requisite  corporate power and authority to own
          and use its  properties  (if  any)  and  assets  and to  carry  on its
          business  as now being  conducted.  NCT has no  material  subsidiaries
          other than as set forth on NCT's most recently  filed Annual Report on
          Form 10-K. Each of such  subsidiaries is a corporation duly organized,
          validly   existing  and  in  good  standing  under  the  laws  of  the
          jurisdiction of its  incorporation  or organization  (as  applicable),
          with the full  corporate  power and authority to carry on its business
          as  currently  conducted.  Each of NCT and  its  subsidiaries  is duly
          qualified  as a  foreign  corporation  to do  business  and is in good
          standing  in every  jurisdiction  in which the nature of the  business
          conducted or property owned by it makes such qualification  necessary,
          except to the extent that the failure to be so qualified or be in good
          standing  would  not have a  material  adverse  effect  on NCT and its
          subsidiaries taken as a whole.

     b.   Authorization, Enforcement, Compliance with Other Instruments. NCT has
          the requisite  corporate power and authority to enter into and perform
          this Agreement,  the NCT Registration Rights Agreement and any related
          agreements  (collectively,  the "NCT Transaction  Documents"),  and to
          issue the  Exchange  Chares in  accordance  with the terms  hereof and
          thereof.  The execution and delivery of the NCT Transaction  Documents
          by NCT  and the  consummation  by it of the  transaction  contemplated
          thereby,  including,  without limitation, the reservation for issuance
          of the Exchange Shares issuable upon exchange thereof,  have been duly
          authorized  by NCT's  Board of  Directors  and no  further  consent or
          authorization  is  required  by NCT,  its  Board of  Directors  or its
          stockholders.  The NCT  Transaction  Documents have been duly executed
          and delivered by NCT and,  when  delivered,  constitute  the valid and
          binding  obligations of NCT enforceable against NCT in accordance with
          their terms,  except as such  enforceability may be limited by general
          principles   of  equity   and   applicable   bankruptcy,   insolvency,
          reorganization,  moratorium,  liquidation or similar laws relating to,
          or affecting  generally  the  enforcement  of,  creditors'  rights and
          remedies,  and subject to the limitation that the  indemnification and
          contribution  provisions of the NCT Registration  Rights Agreement may
          be unenforceable as a matter of public policy.

     c.   Capitalization. As of the date hereof, the authorized capital stock of
          NCT consists of 450,000,000  shares of NCT Common Stock and 10,000,000
          shares of NCT  Preferred  Stock,  of which  approximately  322,000,000
          shares of NCT Common Stock were issued and outstanding as of September
          13, 2000, and,  except for 924 shares of Series G Preferred  Stock, no
          shares of  preferred  stock were issued and  outstanding.  All of such
          outstanding  shares have been duly  authorized  and validly issued and
          are fully paid and  nonassessable.  Except as  disclosed  in  Schedule
          6(c), no shares of NCT Common Stock or NCT Preferred Stock are subject
          to preemptive or similar rights or any liens or encumbrances  suffered
          or permitted by NCT.  Except as disclosed in Schedule  6(c), as of the
          effective date of this Agreement:

               (i) there are no outstanding options,  warrants,  scrip, notes or
               debentures,  rights to subscribe to, calls or  commitments of any
               character   whatsoever  relating  to,  or  securities  or  rights
               convertible  into,  any shares of capital  stock of NCT or any of
               its subsidiaries,  or contracts,  commitments,  understandings or
               arrangements  by which NCT or any of its  subsidiaries  is or may
               become bound to issue  additional  shares of capital stock of NCT
               or any of its subsidiaries;

               (ii) there are no outstanding debt securities; and

               (iii) there are no unperformed  agreements or arrangements  under
               which NCT or any of its subsidiaries is obligated to register the
               sale of any of their  securities  under the 1933 Act  (except the
               NCT Registration Rights Agreement).

          NCT has  furnished  to the  Buyer  true and  correct  copies  of NCT's
          Restated Certificate of Incorporation,  as amended and as in effect on
          the date  hereof  (the  "Certificate  of  Incorporation"),  and  NCT's
          By-laws, as in effect on the date hereof (the "NCT By-laws").

     d.   Issuance of Securities.  The Exchange Shares issuable upon exchange of
          the Series A  Preferred  Shares  have been duly  authorized.  Upon the
          exchange  and against  delivery  of the Series A  Preferred  Shares as
          provided  herein,  the Exchange Shares will be validly  issued,  fully
          paid and nonassessable,  free from all liens,  encumbrances,  security
          interests  and charges  with  respect to the issue  thereof,  with the
          holders  being  entitled  to all  rights  accorded  to a holder of NCT
          Common Stock.  NCT shall pay any stamp transfer tax that may be due in
          connection with any such exchange.

     e.   No Conflicts.  Except as disclosed in Schedule  6(e),  the  execution,
          delivery and performance of this Agreement by NCT and the consummation
          by NCT of the transactions  contemplated  hereby will not (i) conflict
          with or violate the Certificate of  Incorporation  or NCT By-laws,  or
          (ii)  conflict  with or  constitute  a default (or an event which with
          notice or lapse of time or both would become a default) under, or give
          to  others  any  rights of  termination,  amendment,  acceleration  or
          cancellation  of, any agreement,  indenture or instrument to which NCT
          or any of its  subsidiaries is a party,  or (iii) to NCT's  knowledge,
          result in a violation of any law, rule, regulation, order, judgment or
          decree  (including  federal and state  securities laws and regulations
          and the rules and  regulations of the principal  market or exchange on
          which the NCT Common Stock is traded or listed)  applicable  to NCT or
          any of its  subsidiaries,  or by which any property or asset of NCT or
          any of its subsidiaries is bound or affected.

     f.   No Default or Violation. Except as disclosed in Schedule 6(f), neither
          NCT nor its  subsidiaries is in violation of any term of or in default
          under  its   Certificate   of   Incorporation   or  By-laws  or  their
          organizational  charter  or  by-laws,  respectively,  or any  material
          contract, agreement, mortgage,  indebtedness,  indenture,  instrument,
          judgment,   decree  or  order  or  any  statute,  rule  or  regulation
          applicable  to  NCT or  its  subsidiaries.  To  NCT's  knowledge,  the
          business of NCT and its subsidiaries is not being conducted, and shall
          not be conducted in violation of any law,  ordinance or  regulation of
          any governmental entity.

     g.   Consents. Except as specifically contemplated by this Agreement and as
          required under the 1933 Act and applicable  state securities laws, NCT
          is not required to obtain any consent, waiver,  authorization or order
          of, or make any filing or registration with, any court or governmental
          agency in connection  with the  execution,  delivery or performance of
          any of its obligations  under or contemplated by this Agreement or the
          NCT Registration  Rights Agreement in accordance with the terms hereof
          or thereof. Except as disclosed in Section 7(f) and Schedule 6(g), all
          consents, authorizations,  orders, filings and registrations which Pro
          Tech is required to obtain  pursuant to the  preceding  sentence  have
          been obtained or effected on or prior to the date hereof.  NCT and its
          subsidiaries  have no  knowledge of any facts or  circumstances  which
          might give rise to any of the foregoing.

     h.   SEC Documents:  Financial  Statements.  Since January 1, 1998, NCT has
          timely  filed all  reports,  schedules,  forms,  statements  and other
          documents  required  to be filed by it with  the SEC  pursuant  to the
          reporting requirements of the 1934 Act (all of the foregoing materials
          filed prior to the date hereof and all exhibits  included  therein and
          financial   statements,   schedules  and  documents   incorporated  by
          reference  therein,  being  hereinafter  collectively  referred  to as
          "NCT's  SEC  Documents").  NCT  has  delivered  to  the  Buyer  or its
          representative true and complete copies of NCT's SEC Documents.  As of
          their respective  dates, the financial  statements of NCT contained in
          NCT's SEC Documents  (the "NCT Financial  Statements")  complied as to
          form in all material respects with applicable accounting  requirements
          and the  published  rules  and  regulations  of the SEC  with  respect
          thereto  as in  effect  at the  time of  filing.  Such  NCT  Financial
          Statements  have  been  prepared  in  accordance  with  United  States
          generally accepted accounting principles, consistently applied, during
          the periods involved (except (i) as may be otherwise indicated in such
          NCT Financial  Statements or the notes thereto, or (ii) in the case of
          unaudited interim statements, to the extent they may exclude footnotes
          or may be condensed or summary  statements)  and fairly present in all
          material  respects the financial  position of Pro Tech as of the dates
          thereof  and the  results  of its  operations  and cash  flows for the
          periods then ended (subject, in the case of unaudited  statements,  to
          normal year-end audit adjustments).  No other information  provided by
          or on behalf of NCT to the Buyer  which is not  included  in NCT's SEC
          Documents,  including, without limitation,  information referred to in
          Section 4(d) of this  Agreement,  contains  any untrue  statement of a
          material fact or omits to state any material  fact  necessary in order
          to make the statements therein, in the light of the circumstance under
          which they are or were made, not misleading.

     i.   Absence of Certain  Changes.  Except as  disclosed  in Schedule  6(i),
          since the date of the  financial  statements  included  in NCT's  last
          filed Quarterly Report, as amended,  on Form 10-Q for the period ended
          June 30,  2000,  there  has been no  material  adverse  change  and no
          material adverse development in the business, properties,  operations,
          financial condition,  results of operations or prospects of NCT or its
          subsidiaries.  NCT has not taken  any  steps,  and does not  currently
          expect  to  take  any  steps,  to  seek  protection  pursuant  to  any
          bankruptcy law, nor does NCT or its subsidiaries have any knowledge or
          reason to believe that its  creditors  intend to initiate  involuntary
          bankruptcy proceedings.

     j.   Absence  of  Litigation.  Except as  disclosed  in NCT's  registration
          statement on Form S-1 (Registration  No.  333-87757)  originally filed
          with the SEC on  September  24,  1999,  as  amended  by  Pre-effective
          Amendment No. 1 filed on October 28, 1999,  there is no action,  suit,
          proceeding,  inquiry or investigation  before or by any court,  public
          board, government agency, self-regulatory organization or body pending
          or, to the  knowledge  of NCT or any of its  subsidiaries,  threatened
          against  or  affecting  NCT,  the NCT  Common  Stock  or any of  NCT's
          subsidiaries, wherein an unfavorable decision, ruling or finding would
          (i) have a material  adverse effect on the  transactions  contemplated
          hereby;  (ii) adversely affect the validity or  enforceability  of, or
          the authority or ability of NCT to perform its obligations  under, the
          Transaction  Documents;  or (iii)  except  as  expressly  set forth in
          Schedule 6(j), would reasonably be expected to have a material adverse
          effect on the business, operations, properties, financial condition or
          results of operation of NCT and its subsidiaries taken as a whole.

     k.   Acknowledgment  Regarding  Buyer's  Purchase  of  Series  A  Preferred
          Shares.   NCT   acknowledges   and   agrees,    based   upon   Buyer's
          representations, that the Buyer is acting solely in the capacity of an
          arms-length   purchaser   with  respect  to  this  Agreement  and  the
          transactions  contemplated  hereby. NCT further  acknowledges that the
          Buyer is not acting as a financial  advisor or fiduciary of NCT (or in
          any  similar   capacity)  with  respect  to  this  Agreement  and  the
          transactions  contemplated hereby and any advice given by the Buyer or
          any of its  respective  representatives  or agents in connection  with
          this  Agreement  and the  transactions  contemplated  hereby is merely
          incidental to such Buyer's  purchase of the Series A Preferred  Shares
          or exchange of the Series A Preferred  Shares for the Exchange Shares.
          NCT further  represents to the Buyer that NCT's decision to enter into
          this Agreement has been based solely on the independent  evaluation by
          NCT and its representatives.

     l.   No Undisclosed Events, Liabilities,  Developments or Circumstances. To
          NCT's knowledge, no event, liability,  development or circumstance has
          occurred or exists,  or is contemplated to occur,  with respect to NCT
          or  its  subsidiaries  or  their  respective  businesses,  properties,
          prospects,  operations or financial condition, which could be material
          but which has not been  publicly  announced or disclosed in writing to
          the Buyer.

     m.   No General Solicitation.  Neither NCT, nor any of its Affiliates,  nor
          any person acting on its or their behalf, has distributed any offering
          materials  or engaged in any form of general  solicitation  or general
          advertising (within the meaning of Regulation D under the 1933 Act) in
          connection with the offer or sale of the Exchange Shares.

     n.   Employee  Relations.  Neither  NCT  nor  any  of its  subsidiaries  is
          involved in any labor  dispute nor, to the  knowledge of NCT or any of
          its subsidiaries, is any such dispute threatened. None of NCT's or its
          subsidiaries'  employees  is a  member  of a  union  and  NCT  and its
          subsidiaries  believe that their  relations  with their  employees are
          satisfactory.

     o.   Environmental Laws. NCT and its subsidiaries,  to NCT's knowledge, (i)
          are in compliance with any and all applicable foreign,  federal, state
          and local laws and  regulations  relating to the  protection  of human
          health and safety, the environment or hazardous or toxic substances or
          wastes,  pollutants or contaminants  ("Environmental Laws"); (ii) have
          received all  permits,  licenses or other  approvals  required of them
          under  applicable  Environmental  Laws  to  conduct  their  respective
          businesses;  and (iii) are in compliance with all terms and conditions
          of any such permit, license or approval.

     p.   Title. NCT and its subsidiaries  have good and marketable title to, or
          the right to use, all personal  property owned or leased by them which
          is material to the business of NCT and its subsidiaries,  in each case
          free and  clear of all  liens,  encumbrances  and  defects,  except as
          described  in  Schedule  6(p)  and  except  for  those  which  do  not
          materially affect the value of such property or interfere with the use
          made  and  proposed  to be  made  of  such  property  by NCT  and  its
          subsidiaries.  Neither NCT nor its subsidiaries own any real property.
          Any real  property  and  facilities  held  under  lease by NCT and its
          subsidiaries are held by them under valid,  subsisting and enforceable
          leases with such  exceptions  as are not material and do not interfere
          with  the use  made  and  proposed  to be made  of such  property  and
          buildings by NCT and its subsidiaries.

     q.   Insurance.  NCT and each of its  subsidiaries  are insured by insurers
          which NCT believes are of recognized financial  responsibility against
          such  losses  and  risks  and in such  amounts  as  management  of NCT
          believes to be prudent and  customary in the  businesses  in which NCT
          and its subsidiaries are engaged.  Neither NCT nor any such subsidiary
          has been  refused any  insurance  coverage  sought or applied for, and
          neither NCT nor any such subsidiary has any knowledge that it will not
          be able to renew  its  existing  insurance  coverage  as and when such
          coverage  expires or obtain similar coverage from like insurers as may
          be  necessary  to  continue  its  business  at a cost  that  would not
          materially and adversely affect the condition, financial or otherwise,
          or the earnings,  business or operations of NCT and its  subsidiaries,
          taken as a whole.

     r.   Regulatory Permits. NCT and its subsidiaries possess all certificates,
          authorizations,   licenses  and  permits  issued  by  the  appropriate
          federal,  state or foreign regulatory authorities necessary to conduct
          their  respective  businesses,  except  where  failure  to  have  such
          certificates,  authorizations,  licenses  or permits  would not have a
          material adverse effect on the condition,  financial or otherwise,  or
          the  earnings,  business or  operations  of NCT and its  subsidiaries,
          taken as a whole. Neither NCT nor any such subsidiary has no knowledge
          of,  and has  received  no  notice  of,  proceedings  relating  to the
          revocation or  modification  of any such  certificate,  authorization,
          license or permit.

     s.   Internal  Accounting  Controls.  NCT  and  each  of  its  subsidiaries
          maintain  a system  of  internal  accounting  controls  sufficient  to
          provide  reasonable  assurance that (i)  transactions  are executed in
          accordance with management's general or specific authorizations,  (ii)
          transactions  are  recorded  as  necessary  to permit  preparation  of
          financial  statements in conformity with generally accepted accounting
          principles  and to  maintain  asset  accountability,  (iii)  access to
          assets is permitted only in accordance  with  management's  general or
          specific  authorization,  and (iv)  the  recorded  accountability  for
          assets is compared with the existing  assets at  reasonable  intervals
          and appropriate action is taken with respect to any differences.

     t.   No  Materially  Adverse  Contracts,  etc.  Neither  NCT nor any of its
          subsidiaries  is  subject to any  charter,  corporate  or other  legal
          restriction, or any judgment, decree, order, rule or regulation which,
          in the judgment of NCT's officers, has or is expected in the future to
          have  a  material  adverse  effect  on  the  businesses,   properties,
          operations, financial condition, results of operations or prospects of
          NCT or its subsidiaries.  Neither NCT nor any of its subsidiaries is a
          party to any  contract or  agreement  which,  in the judgment of NCT's
          officers,  has or is expected to have a material adverse effect on the
          businesses,  properties,  operations,  financial condition, results of
          operations or prospects of NCT or its subsidiaries.

     u.   Tax Status.  Except as set forth on Schedule 6(u), NCT and each of its
          subsidiaries  has made or filed all federal  and state  income and all
          other  tax  returns,   reports  and   declarations   required  by  any
          jurisdiction  to which it is  subject  (unless  and only to the extent
          that  NCT and each of its  subsidiaries  has set  aside  on its  books
          provisions  reasonably  adequate  for the  payment  of all  unpaid and
          unreported  taxes)  and has  paid all  taxes  and  other  governmental
          assessments  and  charges  that  are  material  in  amount,  shown  or
          determined to be due on such returns, reports and declarations (except
          those  being  contested  in good faith) and has set aside on its books
          provisions  reasonably  adequate  for the  payment  of all  taxes  for
          periods  subsequent to the periods to which such  returns,  reports or
          declarations  apply.  There are no unpaid taxes in any material amount
          claimed to be due by the taxing authority of any jurisdiction, and the
          officers of NCT have no  knowledge  of, and know of no basis for,  any
          such claim.

     v.   Certain  Transactions.  Except as set forth on Schedule  6(v),  in the
          NCT's SEC Documents and arms-length transactions pursuant to which NCT
          makes  payments in the ordinary  course of business upon terms no less
          favorable  than NCT could obtain from third parties and other than the
          grant  of  stock  options  disclosed  on  Schedule  6(c),  none of the
          officers,  directors,  or employees of NCT is presently a party to any
          transaction  with NCT (other than for services as employees,  officers
          and directors), including any contract, agreement or other arrangement
          providing  for the  furnishing  of  services to or by,  providing  for
          rental of real or personal property to or from, or otherwise requiring
          payments to or from any officer,  director or such employee or, to the
          knowledge of NCT, any corporation,  partnership, trust or other entity
          in which any officer, director, or any such employee has a substantial
          interest or is an officer, director, trustee or partner.

     w.   Dilutive Effect.  NCT understands and acknowledges  that the number of
          Exchange  Shares  issuable  upon  exchange  of the Series A  Preferred
          Shares   will   increase   in  certain   circumstances.   NCT  further
          acknowledges  that its  obligation,  if any, to issue NCT Common Stock
          upon the exchange of the Series A Preferred  Stock in accordance  with
          this  Agreement  is  absolute  and  unconditional  regardless  of  the
          dilutive effect that such issuance may have on the ownership interests
          of other stockholders of NCT.

     x.   Fees and Rights of First  Refusal.  NCT is not  obligated to offer the
          securities  offered  hereunder  on a right of first  refusal  basis or
          similar  right to any third  parties  including,  but not  limited to,
          current or former shareholders of NCT, underwriters,  brokers,  agents
          or other third parties.

     y.   Investment  Company.  NCT is not,  and is not  controlled  by or under
          common  control with an Affiliate of, an "investment  company"  within
          the meaning of the Investment Company of Act of 1940, as amended.

     7.   COVENANTS.

     a.   Commercially Reasonable Efforts. Each party shall use its commercially
          reasonable efforts to timely satisfy each of the conditions  precedent
          to Closing as provided in Sections 9, 10 and 11 of this Agreement.

     b.   Form D. Pro Tech agrees to file a Form D with  respect to the Series A
          Preferred Shares,  the Conversion Shares, the Warrants and the Warrant
          Shares as required under  Regulation D promulgated  under the 1933 Act
          and to  provide a copy  thereof  to each  Buyer  promptly  after  such
          filing.  Pro Tech  shall,  on or before the  Closing  Date,  take such
          action as Pro Tech shall reasonably  determine is necessary to qualify
          the Series A Preferred Shares, the Conversion Shares, the Warrants and
          the Warrant Shares for, or obtain exemption for the Series A Preferred
          Shares,  the  Conversion  Shares,  the Warrants and the Warrant Shares
          for,  sale to the Buyers at the  Closing  pursuant  to this  Agreement
          under applicable securities or "Blue Sky" laws of the State of Florida
          and shall  provide  evidence of any such action so taken to the Buyers
          as soon as practicable following the Closing Date.

          NCT  agrees to file a Form D with  respect to the  Exchange  Shares as
          required  under  Regulation  D  promulgated  under the 1933 Act and to
          provide a copy thereof to each Buyer promptly  after such filing.  NCT
          shall, on or before the Exchange Date (as defined in Section 3 above),
          take such action as NCT shall  reasonably  determine  is  necessary to
          qualify the Exchange Shares for, or obtain  exemption for the Exchange
          Shares for,  exchange  to the Buyers at the  Closing  pursuant to this
          Agreement under applicable  securities or "Blue Sky" laws of the state
          of Delaware and shall provide  evidence of any such action so taken to
          the Buyers as soon as  practicable  following  the  Exchange  Date (as
          defined in Section 3 above).

     c.   Reporting Status.  Until the earlier of (i) one year after the date as
          of which  the  Investors  (as  that  term is  defined  in the Pro Tech
          Registration  Rights  Agreement) may sell all of the Conversion Shares
          and the Warrant  Shares  without  restriction  pursuant to Rule 144(k)
          promulgated  under the 1933 Act (or  successor  thereto),  or (ii) the
          date on which (A) the  Investors  shall  have sold all the  Conversion
          Shares and the  Warrant  Shares and (B) none of the Series A Preferred
          Shares  or  Warrants  is  outstanding  (the  "Pro  Tech   Registration
          Period"),  Pro Tech shall file all  reports  required to be filed with
          the SEC pursuant to the 1934 Act, and Pro Tech shall not terminate its
          status as an issuer  required to file reports  under the 1934 Act even
          if  the  1934  Act or  the  rules  and  regulations  thereunder  would
          otherwise permit such termination.

          Until  the  earlier  of (i) one year  after  the date as of which  the
          Investors  (as that term is  defined  in the NCT  Registration  Rights
          Agreement)  may sell all of the Exchange  Shares  without  restriction
          pursuant to Rule 144(k)  promulgated  under the 1933 Act (or successor
          thereto),  or (ii) the date on which (A) the Investors shall have sold
          all the Exchange Shares and (B) none of the Series A Preferred  Shares
          is outstanding  (the "NCT  Registration  Period"),  NCT shall file all
          reports  required  to be filed with the SEC  pursuant to the 1934 Act,
          and NCT shall not terminate  its status as an issuer  required to file
          reports  under  the 1934 Act  even if the  1934 Act or the  rules  and
          regulations thereunder would otherwise permit such termination.

     d.   Use of Proceeds.  Pro Tech shall use all of the proceeds from the sale
          of the  Series A  Preferred  Stock  purchased  hereunder  for  working
          capital and general corporate purposes and not for the satisfaction of
          any  portion  of Pro Tech  borrowings  outside  the  normal  course of
          business. Subject to Section 7(h) hereof, while any shares of Series A
          Preferred Stock or any Conversion Shares remain outstanding,  Pro Tech
          shall not satisfy any obligation or liability of any kind, except that
          Pro Tech may use the proceeds  from the sale of the Series A Preferred
          Stock  purchased  hereunder to satisfy the  $150,000  loan from Westek
          Communications,  the $100,000  loan from Balmore,  S.A.,  the $100,000
          loan from  Austost  Anstalt  Schaan and the  $99,975  loan from Zakeni
          Limited to Pro Tech as evidenced by the Westek Note, the Balmore Note,
          the Austost Note and Zakeni  Note,  respectively,  including,  but not
          limited to,  those owed to a  shareholder,  officer or director of Pro
          Tech, or redeem Pro Tech equity or equity-equivalent securities.

     e.   Financial  Information.  Pro Tech agrees to send the following to each
          Buyer  upon such  Buyer's  request  during  the Pro Tech  Registration
          Period:  (i)  within  five (5) days  after the later of (A) the filing
          thereof with the SEC or (B) the date  Buyer's  request was received by
          Pro Tech, a copy of its Annual  Reports on Form 10-KSB,  its Quarterly
          Reports  on Form  10-QSB,  any  Current  Reports  on Form  8-K and any
          registration  statements or amendments filed pursuant to the 1933 Act;
          (ii) within one (1) day after the later of (A) release  thereof or (B)
          the date Buyer's request was received by Pro Tech, copies of all press
          releases  issued  by Pro Tech or any of its  subsidiaries;  and  (iii)
          copies  of  the  same  notices  and  other  information  given  to the
          shareholders of Pro Tech generally,  contemporaneously with the giving
          thereof to the shareholders.

          NCT  agrees to send the  following  to each  Buyer  upon such  Buyer's
          request during the NCT Registration  Period:  (i) within five (5) days
          after the filing thereof with the SEC, a copy of its Annual Reports on
          Form 10-K, its Quarterly  Reports on Form 10-Q, any Current Reports on
          Form 8-K and any registration  statements or amendments filed pursuant
          to the 1933 Act; (ii) within one (1) day after release thereof, copies
          of all press releases  issued by NCT or any of its  subsidiaries;  and
          (iii)  copies of the same notices and other  information  given to the
          stockholders  of NCT  generally,  contemporaneously  with  the  giving
          thereof to the stockholders.

     f.   Reservation of Shares. Pro Tech shall take all action necessary to, at
          all times,  have  authorized and reserved for the purpose of issuance,
          no less than 115% of the  number of shares of Common  Stock  needed to
          provide for the  issuance of (i) the  Conversion  Shares to effect the
          conversion   of  the  Series  A  Preferred   Shares  then  issued  and
          outstanding, and (ii) the Warrant Shares for which the Warrants may be
          exercised.

          NCT shall take all action necessary to, at all times,  have authorized
          and  reserved  for the purpose of  issuance,  no less than 115% of the
          number  of shares  of NCT  Common  Stock  needed  to  provide  for the
          issuance of the Exchange Shares to effect the exchange of the Series A
          Preferred Shares then issued and outstanding.

     g.   Listings.  Pro Tech shall take all steps reasonably necessary to cause
          the  Conversion  Shares  and the  Warrant  Shares to be  approved  for
          quotation  on  the  OTC  Bulletin  Board,  subject  to the  terms  and
          conditions of the Pro Tech Registration Rights Agreement, and Pro Tech
          shall  use  its  commercially   reasonable  efforts  to  maintain  the
          quotation  of its Common  Stock on such  market,  as long as the rules
          governing  such  quotation  do not  change.  Pro Tech  shall  promptly
          provide to each Buyer copies of any notices it receives  regarding the
          continued  eligibility of the Common Stock for trading on the facility
          on which it is listed.

          NCT  shall  also  take all  steps  reasonably  necessary  to cause the
          Exchange  Shares to be  approved  for  quotation  on the OTC  Bulletin
          Board, and NCT shall use its best efforts to maintain the quotation of
          its NCT Common  Stock on such market,  as long as the rules  governing
          such quotation do not change. NCT shall promptly provide to each Buyer
          copies of any notices it receives regarding the continued  eligibility
          of the NCT Common  Stock for  trading on the  facility  on which it is
          listed.

     h.   Expenses. Each of Pro Tech, NCT and the Buyers shall pay all costs and
          expenses  incurred by such party in connection  with the  negotiation,
          investigation,  preparation, execution and delivery of the Transaction
          Documents.  Pro Tech and NCT shall pay all fees, costs and expenses of
          their   respective   counsel  in  connection  with  the   negotiation,
          investigation,  preparation, execution and delivery of the Transaction
          Documents at Closing.

     i.   [LEFT INTENTIONALLY BLANK]

     j.   Corporate  Existence.  So long as any Series A Preferred Shares remain
          outstanding,  Pro Tech shall not directly or indirectly consummate any
          merger, reorganization,  restructuring,  consolidation, sale of all or
          substantially  all of Pro Tech's assets or any similar  transaction or
          related  transactions  (each such  transaction,  a "Sale of Pro Tech")
          except if the surviving or successor  entity in such  transaction  (i)
          expressly assumes,  in writing,  Pro Tech's obligations  hereunder and
          under  the Pro  Tech  Registration  Rights  Agreement,  the  Series  A
          Preferred Shares and any other agreements and instruments entered into
          or  delivered  by Pro  Tech  in  connection  herewith;  and  (ii) is a
          publicly traded  corporation  whose common stock is listed for trading
          on the OTC Bulletin Board, New York Stock Exchange, Inc., the American
          Stock Exchange or the NASDAQ Small Cap or National Market.

     k.   Transactions With Affiliates. So long as (i) twenty-five percent (25%)
          of the  originally  issued  shares of the  Series A  Preferred  Shares
          issued  pursuant to this Agreement are  outstanding or (ii) the Buyers
          collectively own Conversion  Shares with an aggregate Market Value (as
          defined  below) as of the date of the  Transaction  (as defined below)
          equal to or greater  than  $375,000,  Pro Tech  shall not enter  into,
          amend,  modify or  supplement  any  transaction  (the type of which is
          required to be disclosed  under Item 404 of Regulation S-B promulgated
          under  the  1933  Act)  ("Transaction")  with  any  of  its  officers,
          directors,  persons who were  officers or directors at any time during
          the previous two years,  shareholders  who beneficially own 5% or more
          of the Common Stock,  affiliates  (as defined  below),  any individual
          related by blood, marriage, or adoption to any such individual or with
          any entity in which any such  entity or  individual  owns a 5% or more
          beneficial interest (each a "Related Party"), except for (a) customary
          employment  arrangements and benefit programs on reasonable terms, (b)
          any  Transaction  on an  arms-length  basis on terms no less favorable
          than terms which would have been  obtainable  from a person other than
          such Related  Party,  and (c) any  Transaction  which is approved by a
          majority of the  disinterested  directors  of Pro Tech.  For  purposes
          hereof,  "Market Value" per share of Conversion Shares is equal to the
          lowest  average of the average of the Closing Bid Price (as defined in
          Section 3(b) hereof) for the Common Stock for any consecutive five (5)
          day trading  period out of the fifteen (15) trading days preceding the
          date of such  Transaction.  "Disinterested  director"  for purposes of
          approving a Transaction pursuant to this Section 7(k) means a director
          of Pro Tech who is not a party to such  Transaction.  "Affiliate"  for
          purposes of this  Section  7(k) means,  with  respect to any person or
          entity, another person or entity that, directly or indirectly, (i) has
          a 5% or more equity interest in that person or entity,  (ii) has 5% or
          more common ownership with that person or entity,  (iii) controls that
          person or entity,  or (iv) share  common  control  with that person or
          entity.  "Control"  or  "controls"  for  purposes  hereof means that a
          person or entity  has the  power,  direct or  indirect,  to conduct or
          govern the policies of another person or entity.

          So long as (i) any Series A Preferred  Shares are  outstanding or (ii)
          the Buyers  collectively own Exchange Shares with a market value equal
          to or greater  than  $375,000,  NCT shall not, and shall cause each of
          its subsidiaries not to, enter into, amend,  modify or supplement,  or
          permit any subsidiary to enter into,  amend,  modify or supplement any
          agreement, transaction,  commitment, or arrangement with any of its or
          any  subsidiary's  officers,  directors,  person who were  officers or
          directors at any time during the previous two years,  stockholders who
          beneficially own 5% or more of the NCT Common Stock,  affiliates,  any
          individual  related  by  blood,  marriage,  or  adoption  to any  such
          individual  or with any entity in which any such entity or  individual
          owns a 5% or more beneficial interest (each a "Related Party"), except
          for (a)  customary  employment  arrangements  and benefit  programs on
          reasonable  terms,  (b) any  agreement,  transaction,  commitment,  or
          arrangement  on an  arms-length  basis on terms no less favorable than
          terms which would have been  obtainable  from a person other than such
          Related  Party,  (c)  any  agreement,   transaction,   commitment,  or
          arrangement  which is  approved  by a  majority  of the  disinterested
          directors  of NCT. For  purposes  hereof,  any director who is also an
          officer of NCT or any  subsidiary of NCT shall not be a  disinterested
          director with respect to any such agreement, transaction,  commitment,
          or arrangement.

     l.   No Short Sales of the Common Stock or NCT Common  Stock.  So long as a
          Buyer  has  Conversion  Shares,  Exchange  Shares  or  Warrant  Shares
          registered  under a registration  statement  which have not been sold,
          such Buyer or its  Affiliates  shall not engage in any short  sales or
          third  party short  sales of the Common  Stock or NCT Common  Stock in
          violation of  Regulation M  promulgated  under the 1934 Act, or hold a
          "put  equivalent  position"  with  respect to the Common  Stock or NCT
          Common  Stock (as defined in Rule 16a-1 under the 1934 Act);  provided
          however,  that the Buyer's  sale of Common  Stock or NCT Common  Stock
          which the  Buyer  owned  prior to such  registration  and  which  were
          acquired  outside of this  Agreement  shall not be deemed a short sale
          under this Agreement.

     8.   TRANSFER AGENT INSTRUCTIONS.

     a.   Pro Tech shall issue irrevocable instructions to its transfer agent to
          issue  certificates,  registered  in  the  name  of  a  Buyer  or  its
          respective nominee(s), for the Conversion Shares and Warrant Shares in
          such amounts as specified  from time to time by such Buyer to Pro Tech
          upon  conversion  of  the  Series  A  Preferred  Shares  ("Pro  Tech's
          Irrevocable Transfer Agent Instructions"). All such certificates shall
          bear  the  restrictive  legend  specified  in  Section  4(k)  of  this
          Agreement.  Pro  Tech  warrants  that no  instruction  other  than the
          Irrevocable Transfer Agent Instructions referred to in this Section 8,
          and stop transfer  instructions  to give effect to Section 4(i) hereof
          (in the case of the  Conversion  Shares and  Warrant  Shares  prior to
          registration  of such shares  under the 1933 Act) will be given by Pro
          Tech to its  transfer  agent and that the Series A Preferred  Shares ,
          the  Conversion  Shares,  the  Warrants  and the Warrant  Shares shall
          otherwise be freely  transferable on the books and records of Pro Tech
          as and to the extent provided in the Transaction Documents. Nothing in
          this Section 8 shall affect in any way such  Buyer's  obligations  and
          agreement to comply with all applicable  federal and state  securities
          laws upon resale of the Series A Preferred Shares,  Conversion Shares,
          the Warrant or the Warrant  Shares.  If such Buyer  provides  Pro Tech
          with an  opinion  of  counsel,  reasonably  satisfactory  in form  and
          substance to Pro Tech, that  registration  for resale by such Buyer of
          any of the Series A Preferred Shares,  Conversion  Shares, the Warrant
          or the Warrant  Shares is not  required  under the 1933 Act,  Pro Tech
          shall permit the transfer, subject to the limitations and restrictions
          set forth in this Agreement and the other Transaction Documents,  and,
          in the case of the Conversion Shares and the Warrant Shares,  promptly
          instruct its transfer agent to issue one or more  certificates in such
          name and in such  denominations  as specified by such Buyer.  Pro Tech
          acknowledges  that a breach by it of its  obligations  hereunder  will
          cause  irreparable  harm to such  Buyer by  vitiating  the  intent and
          purpose of the transaction contemplated hereby. Accordingly,  Pro Tech
          acknowledges  that the  remedy at law for a breach of its  obligations
          under this Section 8 will be inadequate and agrees,  in the event of a
          breach  or  threatened  breach by Pro Tech of the  provisions  of this
          Section 8, that such Buyer shall be entitled, in addition to all other
          available  remedies,  to an  injunction  restraining  any  breach  and
          requiring  immediate  issuance and transfer,  without the necessity of
          showing  economic  loss and without any bond or other  security  being
          required.

     b.   NCT shall issue  irrevocable  instructions  to its  transfer  agent to
          issue  certificates,  registered  in  the  name  of the  Buyer  or its
          respective  nominee(s),  for the  Exchange  Shares in such  amounts as
          specified  from time to time by the Buyer to NCT upon  exchange of the
          Series A Preferred Shares for NCT Common Stock (the "NCT's Irrevocable
          Transfer Agent  Instructions").  Prior to registration of the Exchange
          Shares  under  the 1933  Act,  all such  certificates  shall  bear the
          restrictive  legend  specified in Section 4(l) of this Agreement.  NCT
          warrants that no instruction other than the Irrevocable Transfer Agent
          Instructions  referred  to  in  this  Section  8,  and  stop  transfer
          instructions   to  give  effect  to  Section  4(j)  hereof  (prior  to
          registration  of such shares  under the 1933 Act) will be given by NCT
          to its transfer agent and that the Exchange  Shares shall otherwise be
          freely  transferable  on the  books and  records  of NCT as and to the
          extent  provided in this  Agreement  and the NCT  Registration  Rights
          Agreement.  Nothing  in this  Section  8 shall  affect  in any way the
          Buyer's  obligations  and  agreement  to  comply  with all  applicable
          federal and state  securities laws upon resale of the Exchange Shares.
          If the Buyer  provides  NCT with an  opinion  of  counsel,  reasonably
          satisfactory  in form and  substance  to NCT,  that  registration  for
          resale by the  Buyer of any of the  Exchange  Shares  is not  required
          under the 1933  Act,  NCT  shall  permit  the  transfer  and  promptly
          instruct its transfer agent to issue one or more  certificates in such
          name  and  in  such  denominations  as  specified  by the  Buyer.  NCT
          acknowledges  that a breach by it of its  obligations  hereunder  will
          cause  irreparable  harm to the  Buyer by  vitiating  the  intent  and
          purpose  of the  transaction  contemplated  hereby.  Accordingly,  NCT
          acknowledges  that the  remedy at law for a breach of its  obligations
          under this Section 8 will be inadequate and agrees,  in the event of a
          breach or threatened  breach by NCT of the  provisions of this Section
          8,  that the  Buyer  shall  be  entitled,  in  addition  to all  other
          available  remedies,  to an  injunction  restraining  any  breach  and
          requiring  immediate  issuance and transfer,  without the necessity of
          showing  economic  loss and without any bond or other  security  being
          required.

     9.   CONDITIONS PRECEDENT TO PRO TECH'S OBLIGATION TO SELL.

     The  obligation  of Pro  Tech  hereunder  to issue  and  sell the  Series A
Preferred Shares to the Buyers at the Closing is subject to the satisfaction, at
or before the Closing Date, of each of the following  conditions,  provided that
these conditions may be waived by Pro Tech at any time in its sole discretion:

     a.   The  Buyers  shall  have  executed  this   Agreement,   the  Pro  Tech
          Registration  Rights Agreement,  the NCT Registration Rights Agreement
          and delivered same to Pro Tech.

     b.   NCT shall have executed this Agreement and the NCT Registration Rights
          Agreement and delivered same to Pro Tech.

     c.   The Buyers shall have  delivered to Pro Tech,  and Pro Tech shall have
          received,  the Purchase Price for the Series A Preferred  Shares being
          purchased  by the Buyers at the  Closing in United  States  dollars by
          wire  transfer of  immediately  available  funds  pursuant to the wire
          instructions  provided  by  Pro  Tech  or  as  otherwise  provided  in
          paragraph 1(c) above.

     d.   Pro Tech shall have received the opinion of NCT's counsel, dated as of
          the Closing Date, in form and substance reasonably satisfactory to Pro
          Tech and in substantially the form of Exhibit "H" attached hereto

     e.   The  representations  and  warranties  of the Buyers shall be true and
          correct in all  material  respects  as of the date when made and as of
          the   Closing   Date  as  though   made  at  that  time   (except  for
          representations  and warranties that speak as of a specific date), and
          the  Buyers  shall  have  performed,  satisfied  and  complied  in all
          material  respects  with  the  covenants,  agreements  and  conditions
          required by this Agreement to be performed, satisfied or complied with
          by the  Buyers at or prior to the  Closing  Date.  Pro Tech shall have
          received a certificate,  executed by the Chief Financial  Officer,  or
          other  executive  officer  acting  in  such  capacity,  of each of the
          Buyers,  dated as of the Closing Date, to the foregoing  effect and as
          to such other matters as may be reasonably requested by Pro Tech.

     f.   The representations and warranties of NCT shall be true and correct in
          all  material  respects as of the date when made and as of the Closing
          Date as  though  made at that time  (except  for  representations  and
          warranties  that  speak as of a  specific  date),  and NCT shall  have
          performed,  satisfied  and complied in all material  respects with the
          covenants,  agreements and conditions required by this Agreement to be
          performed,  satisfied  or  complied  with  by NCT at or  prior  to the
          Closing Date. Pro Tech shall have received a certificate,  executed by
          the Chief Financial Officer, or other executive officer acting in such
          capacity,  of NCT,  dated as of the  Closing  Date,  to the  foregoing
          effect and as to such other matters as may be reasonably  requested by
          Pro Tech including,  without  limitation,  an update as of the Closing
          Date regarding the representation contained in Section 6(c) above.

     10.  CONDITIONS PRECEDENT TO THE BUYERS' OBLIGATION TO PURCHASE.

     The  obligation of each Buyer  hereunder to purchase the Series A Preferred
Shares at the Closing is subject to the  satisfaction,  at or before the Closing
Date, of each of the following conditions, provided that these conditions may be
waived by the Buyers at any time in their sole discretion:

     a.   Pro Tech and NCT shall have executed this Agreement and delivered same
          to the Buyers.

     b.   NCT shall have  executed the NCT  Registration  Rights  Agreement  and
          delivered same to the Buyers.

     c.   Pro  Tech  shall  have  executed  the  Pro  Tech  Registration  Rights
          Agreement and delivered same to the Buyers.

     d.   The Articles of Amendment shall have been duly authorized by the Board
          of Directors of Pro Tech and filed with the  Secretary of State of the
          State of Florida.

     e.   Both the Common Stock and the NCT Common Stock shall be authorized for
          quotation on the OTC Bulletin Board,  over-the-counter  market,  AMEX,
          the  NASDAQ  Small  Cap or  National  Market  or The  New  York  Stock
          Exchange,  Inc.,  and trading in the Common Stock and NCT Common Stock
          shall not have been suspended for any reason.

     f.   The  representations  and  warranties  of Pro  Tech  shall be true and
          correct in all  material  respects  (except to the extent  that any of
          such  representations  and  warranties  is  already  qualified  as  to
          materiality in Section 5 above,  in which case,  such  representations
          and   warranties   shall  be  true   and   correct   without   further
          qualification)  as of the date when made and as of the Closing Date as
          though made at that time (except for  representations  and  warranties
          that speak as of a specific  date) and Pro Tech shall have  performed,
          satisfied and complied in all material  respects  with the  covenants,
          agreements and conditions  required by this Agreement to be performed,
          satisfied  or  complied  with by Pro Tech at or  prior to the  Closing
          Date.  The Buyers shall have received a  certificate,  executed by the
          Chief Financial  Officer,  or other  executive  officer acting in such
          capacity,  of Pro Tech, dated as of the Closing Date, to the foregoing
          effect and as to such other matters as may be reasonably  requested by
          the Buyers including,  without limitation, an update as of the Closing
          Date regarding the representation contained in Section 5(c) above.

     g.   The representations and warranties of NCT shall be true and correct in
          all  material  respects  (except  to  the  extent  that  any  of  such
          representations  and warranties is already qualified as to materiality
          in Section 6 above, in which case, such representations and warranties
          shall be true and correct  without  further  qualification)  as of the
          date when made and as of the Closing  Date as though made at that time
          (except for representations and warranties that speak as of a specific
          date) and NCT shall have  performed,  satisfied  and  complied  in all
          material  respects  with  the  covenants,  agreements  and  conditions
          required by this Agreement to be performed, satisfied or complied with
          by Pro Tech at or prior to the  Closing  Date.  The Buyers  shall have
          received a certificate,  executed by the Chief Financial  Officer,  or
          other executive  officer acting in such capacity,  of NCT, dated as of
          the Closing Date, to the foregoing effect and as to such other matters
          as may  be  reasonably  requested  by the  Buyers  including,  without
          limitation,   an  update  as  of  the  Closing  Date   regarding   the
          representation contained in Section 6(c) above.

     h.   The Buyers  shall have  received  the  opinion of Pro Tech's  counsel,
          dated  as of the  Closing  Date,  in  form  and  substance  reasonably
          satisfactory  to the Buyers and in  substantially  the form of Exhibit
          "I" attached hereto.

     i.   The Buyers shall have received the opinion of NCT's counsel,  dated as
          of the Closing Date, in form and substance reasonably  satisfactory to
          the  Buyers and in  substantially  the form of  Exhibit  "H"  attached
          hereto.

     j.   Pro Tech shall have  executed and  delivered to each of the Buyers (or
          the   Buyers'   designees)   the  Series  A   Certificates   (in  such
          denominations  as the Buyers shall request) for the Series A Preferred
          Shares being purchased by each such Buyer at the Closing.

     k.   The Board of Directors of Pro Tech shall have adopted the  resolutions
          in substantially the form of Exhibit "J" attached hereto.

     l.   Pro  Tech's  Irrevocable  Transfer  Agent  Instructions,  in form  and
          substance satisfactory to the Buyers, shall have been delivered to and
          acknowledged in writing by Pro Tech's transfer agent.

     m.   NCT's Irrevocable  Transfer Agent Instructions,  in form and substance
          satisfactory  to  the  Buyers,   shall  have  been  delivered  to  and
          acknowledged in writing by NCT's transfer agent.

     11.  CONDITIONS PRECEDENT TO NCT'S OBLIGATION TO EXCHANGE

     The  obligation of NCT hereunder to issue the Exchange  Shares to each such
Buyer at an  Exchange  Date is  subject  to the  satisfaction,  at or before the
Closing  Date,  of  each  of  the  following  conditions,  provided  that  these
conditions may be waived by NCT at any time in its sole discretion:

     a.   Such  Buyer  shall  have  executed  this   Agreement,   the  Pro  Tech
          Registration   Rights  Agreement  and  the  NCT  Registration   Rights
          Agreement and delivered same to NCT.

     b.   Pro  Tech  shall  have  executed  this  Agreement  and  the  Pro  Tech
          Registration Rights Agreement and delivered same to NCT.

     c.   The Articles of Amendment shall have been duly authorized by the Board
          of Directors of Pro Tech and filed with the  Secretary of State of the
          State of Florida.

     d.   Such Buyer shall have delivered to Pro Tech the Purchase Price for the
          Series A Preferred Shares being purchased by such Buyer at the Closing
          in United  States  dollars by wire transfer of  immediately  available
          funds  pursuant  to the wire  instructions  provided by Pro Tech or as
          otherwise provided in paragraph 1(c) above.

     e.   NCT shall have received an opinion of Pro Tech's counsel,  dated as of
          the Closing Date, in form and substance reasonably satisfactory to NCT
          and in substantially the form of Exhibit "I" attached hereto.

     12.  INDEMNIFICATION.

     a.   By Pro Tech.

               (i) In  consideration  of the Buyers'  execution  and delivery of
               this Agreement and acquisition of the Series A Preferred  Shares,
               the  Conversion  Shares,  the  Warrants  and the  Warrant  Shares
               hereunder, and in addition to all of Pro Tech's other obligations
               under this Agreement, but subject to the limitations set forth in
               Section 6 of the Pro Tech Registration Rights Agreement, Pro Tech
               shall  defend,  protect,  indemnify  and hold harmless each Buyer
               (each a "Buyer Indemnitee") from and against any and all actions,
               causes of action, suits, claims, losses, costs, penalties,  fees,
               liabilities  and damages,  and expenses in  connection  therewith
               (irrespective  of whether such Buyer Indemnitee is a party to the
               action  for  which  indemnification  hereunder  is  sought),  and
               including  reasonable  attorneys'  fees  and  disbursements  (the
               "Buyer Indemnified  Liabilities")  incurred by a Buyer Indemnitee
               in  connection  with or as a result of any  breach by Pro Tech of
               any  representation,  warranty  or  covenant  in the  Transaction
               Documents,    including,    but   not   limited   to:   (a)   any
               misrepresentation  or breach of any  representation  or  warranty
               made  by Pro  Tech  in the  Transaction  Documents  or any  other
               certificate,   instrument  or  document  contemplated  hereby  or
               thereby;  or  (b)  any  breach  of  any  covenant,  agreement  or
               obligation of Pro Tech contained in the Transaction  Documents or
               any other certificate, instrument or document contemplated hereby
               or thereby;  provided,  however, that this Section 12(a)(i) shall
               not apply to the extent that it is finally judicially  determined
               that such  actions,  causes of  action,  suits,  claims,  losses,
               costs, penalties,  fees, liabilities and damages, and expenses in
               connection therewith resulted solely from the gross negligence or
               bad  faith  of such  Buyer  Indemnitee.  To the  extent  that the
               foregoing  undertaking by Pro Tech may be  unenforceable  for any
               reason,  Pro Tech  shall  make the  maximum  contribution  to the
               payment  and  satisfaction  of  each  of  the  Buyer  Indemnified
               Liabilities which is permissible under applicable law.

               (ii) In  consideration  of NCT's  execution  and delivery of this
               Agreement, and in addition to all of Pro Tech's other obligations
               under this Agreement,  Pro Tech shall defend, protect,  indemnify
               and hold  harmless NCT and its  respective  officers,  directors,
               agents,  and controlling  persons  thereof and permitted  assigns
               (each a "NCT Indemnitee"),  from and against any and all actions,
               causes of action, suits, claims, losses, costs, penalties,  fees,
               liabilities  and damages,  and expenses in  connection  therewith
               (irrespective  of whether any such NCT  Indemnitee  is a party to
               the action for which  indemnification  hereunder is sought),  and
               including reasonable  attorneys' fees and disbursements (the "NCT
               Indemnified  Liabilities") incurred by the NCT Indemnitees or any
               of them in  connection  with or as a result of any  breach by Pro
               Tech  of  any   representation,   warranty  or  covenant  in  the
               Transaction  Documents,  including,  but not  limited to: (a) any
               misrepresentation  or breach of any  representation  or  warranty
               made  by Pro  Tech  in the  Transaction  Documents  or any  other
               certificate,   instrument  or  document  contemplated  hereby  or
               thereby;  or  (b)  any  breach  of  any  covenant,  agreement  or
               obligation of Pro Tech contained in the Transaction  Documents or
               any other certificate, instrument or document contemplated hereby
               or thereby; provided,  however, that this Section 12(a)(ii) shall
               not apply to the extent that it is finally judicially  determined
               that such  actions,  causes of  action,  suits,  claims,  losses,
               costs, penalties,  fees, liabilities and damages, and expenses in
               connection therewith resulted solely from the gross negligence or
               bad  faith  of  such  NCT  Indemnitee.  To the  extent  that  the
               foregoing  undertaking by Pro Tech may be  unenforceable  for any
               reason,  Pro Tech  shall  make the  maximum  contribution  to the
               payment  and   satisfaction   of  each  of  the  NCT  Indemnified
               Liabilities which is permissible under applicable law.

     b.   By NCT.

               (i) In  consideration  of the Buyers'  execution  and delivery of
               this Agreement and acquisition of Exchange Shares hereunder,  and
               in  addition  to  all  of  NCT's  other  obligations  under  this
               Agreement,  but subject to the limitations set forth in Section 6
               of the NCT  Registration  Rights  Agreement,  NCT  shall  defend,
               protect,  indemnify and hold harmless each Buyer  Indemnitee from
               and against the Buyer  Indemnified  Liabilities  incurred by such
               Buyer  Indemnitee in connection with or as a result of any matter
               referred  to in the  Transaction  Documents,  including,  but not
               limited   to:  (a)  any   misrepresentation   or  breach  of  any
               representation  or  warranty  made  by  NCT  in  the  Transaction
               Documents  or  any  other  certificate,  instrument  or  document
               contemplated  hereby  or  thereby;  or  (b)  any  breach  of  any
               covenant,  agreement  or  obligation  of  NCT  contained  in  the
               Transaction  Documents or any other  certificate,  instrument  or
               document contemplated hereby or thereby; provided,  however, that
               this  Section  12(b)(i)  shall not apply to the extent that it is
               finally  judicially  determined  that  such  actions,  causes  of
               action,   suits,  claims,   losses,   costs,   penalties,   fees,
               liabilities  and damages,  and expenses in  connection  therewith
               resulted  solely from the gross  negligence  or bad faith of such
               Buyer Indemnitee. To the extent that the foregoing undertaking by
               NCT may be  unenforceable  for any  reason,  NCT  shall  make the
               maximum  contribution to the payment and  satisfaction of each of
               the Buyer  Indemnified  Liabilities  which is  permissible  under
               applicable law.

               (ii) In  consideration  of Pro Tech's  execution  and delivery of
               this  Agreement  and  issuance of the Series A  Preferred  Shares
               which may be exchanged  for Exchange  Share as described  herein,
               and in  addition  to all of NCT's  other  obligations  under this
               Agreement, NCT shall defend, protect, indemnify and hold harmless
               Pro Tech and its  directors,  officers,  agents  and  controlling
               persons thereof (each a "Pro Tech Indemnitee"),  from and against
               any and all actions,  causes of action,  suits,  claims,  losses,
               costs, penalties,  fees, liabilities and damages, and expenses in
               connection  therewith  (irrespective of whether any such Pro Tech
               Indemnitee  is a party to the  action  for which  indemnification
               hereunder is sought),  and including  reasonable  attorneys' fees
               and  disbursements  (the  "Pro  Tech  Indemnified  Liabilities"),
               incurred by the ProTech  Indemnitees or any of them in connection
               with or as a result of any matter  referred to in the Transaction
               Documents,    including,    but   not   limited   to:   (a)   any
               misrepresentation  or breach of any  representation  or  warranty
               made  by  NCT  in  the   Transaction   Documents   or  any  other
               certificate,   instrument  or  document  contemplated  hereby  or
               thereby;  or  (b)  any  breach  of  any  covenant,  agreement  or
               obligation of NCT contained in the  Transaction  Documents or any
               other certificate,  instrument or document contemplated hereby or
               thereby; provided, however, that this Section 12(b)(ii) shall not
               apply to the extent that it is finally judicially determined that
               such actions,  causes of action,  suits, claims,  losses,  costs,
               penalties,   fees,  liabilities  and  damages,  and  expenses  in
               connection therewith resulted solely from the gross negligence or
               bad  faith  of such  Pro  Tech  Indemnitee,  as the  case may be,
               respectively. To the extent that the foregoing undertaking by NCT
               may be unenforceable  for any reason,  NCT shall make the maximum
               contribution  to the payment and  satisfaction of each of the Pro
               Tech  Indemnified  Liabilities,  as the  case  may be,  which  is
               permissible under applicable law.

     c.   By the Buyers.

               (i) In consideration of Pro Tech's execution and delivery of this
               Agreement  and  issuance  of the Series A Preferred  Shares,  the
               Conversion Shares, Warrants and Warrant Shares hereunder,  and in
               addition  to all of the  Buyers'  other  obligations  under  this
               Agreement,  but subject to the limitations set forth in Section 6
               of the  Pro  Tech  Registration  Rights  Agreement,  each  Buyer,
               severally and not jointly, shall defend,  protect,  indemnify and
               hold harmless the Pro Tech  Indemnitees  from and against the Pro
               Tech Indemnified Liabilities incurred by the Pro Tech Indemnitees
               or any of them in connection with or as a result of any breach by
               such Buyer of any  representation,  warranty  or  covenant in the
               Transaction  Documents,  including,  but not  limited to: (a) any
               misrepresentation  or breach of any  representation  or  warranty
               made by such  Buyer in the  Transaction  Documents  or any  other
               certificate,   instrument  or  document  contemplated  hereby  or
               thereby;  or  (b)  any  breach  of  any  covenant,  agreement  or
               obligation of such Buyer contained in the  Transaction  Documents
               or any other  certificate,  instrument  or document  contemplated
               hereby or thereby; provided,  however, that this Section 12(c)(i)
               shall  not  apply to the  extent  that it is  finally  judicially
               determined that such actions,  causes of action,  suits,  claims,
               losses,  costs,  penalties,  fees,  liabilities and damages,  and
               expenses in connection  therewith  resulted solely from the gross
               negligence  or bad  faith  of such Pro  Tech  Indemnitee.  To the
               extent  that  the  foregoing  undertaking  by such  Buyer  may be
               unenforceable  for any reason,  such Buyer shall make the maximum
               contribution  to the payment and  satisfaction of each of the Pro
               Tech   Indemnified   Liabilities   which  is  permissible   under
               applicable law.

               (ii) In  consideration  of NCT's  execution  and delivery of this
               Agreement and issuance of the Exchange Shares  hereunder,  and in
               addition  to all of the  Buyers'  other  obligations  under  this
               Agreement,  but subject to the limitations set forth in Section 6
               of the NCT  Registration  Rights  Agreement,  as the case may be,
               each Buyer,  severally and not jointly,  shall  defend,  protect,
               indemnify and hold harmless the NCT Indemnitees  from and against
               the NCT Indemnified  Liabilities  incurred by the NCT Indemnitees
               or any of them in connection with or as a result of any breach by
               such Buyer of any  representation,  warranty  or  covenant in the
               Transaction  Documents,  including,  but not  limited to: (a) any
               misrepresentation  or breach of any  representation  or  warranty
               made by such  Buyer in the  Transaction  Documents  or any  other
               certificate,   instrument  or  document  contemplated  hereby  or
               thereby;  or  (b)  any  breach  of  any  covenant,  agreement  or
               obligation of such Buyer contained in the  Transaction  Documents
               or any other  certificate,  instrument  or document  contemplated
               hereby or thereby;  provided,  however,  that this Section  12(c)
               shall  not  apply to the  extent  that it is  finally  judicially
               determined that such actions,  causes of action,  suits,  claims,
               losses,  costs,  penalties,  fees,  liabilities and damages,  and
               expenses in connection  therewith  resulted solely from the gross
               negligence  or bad faith of such NCT  Indemnitee.  To the  extent
               that the foregoing undertaking by such Buyer may be unenforceable
               for any reason, such Buyer shall make the maximum contribution to
               the  payment  and  satisfaction  of each  of the NCT  Indemnified
               Liabilities which is permissible under applicable law.

     d.   Promptly  after receipt by a Buyer  Indemnitee,  a NCT Indemnitee or a
          Pro Tech  Indemnitee  (each Buyer  Indemnitee,  NCT Indemnitee and Pro
          Tech  Indemnitee  are  sometimes  referred  to herein as  "Indemnified
          Party") under this Section of notice of the commencement of any action
          or proceeding involving any breach of any representation,  warranty or
          covenant in the  Transaction  Documents  ("Claim"),  such  Indemnified
          Party shall,  if a Claim in respect  thereof is to be made against any
          indemnifying  party (the  "Indemnifying  Party")  under this  Section,
          deliver to the Indemnifying Party a written notice of the commencement
          thereof.  The  Indemnifying  Party shall have the right to participate
          in, and, to the extent the Indemnifying Party so desires, jointly with
          any other Indemnifying  Party similarly noticed,  to assume control of
          the  defense  thereof  with  counsel  mutually   satisfactory  to  the
          Indemnifying  Party  and the  Indemnified  Party,  as the case may be;
          provided,  however,  that an Indemnified Party shall have the right to
          retain its own  counsel  with the fees and  expenses to be paid by the
          Indemnifying  Party, if, in the reasonable opinion of counsel retained
          by the Indemnifying  Party, the  representation by such counsel of the
          Indemnified  Party and the  Indemnifying  Party would be inappropriate
          due to  actual  or  potential  conflicts  of  interests  between  such
          Indemnified  Party and any other party  represented by such counsel in
          such proceeding.  The Indemnified Party shall cooperate fully with the
          Indemnifying  Party in connection  with any  negotiation or defense of
          any such action or claim by the  Indemnifying  Party and shall furnish
          to the Indemnifying Party all information  reasonably available to the
          Indemnified   Party  which  relates  to  such  action  or  claim.  The
          Indemnifying  Party shall keep the Indemnified Party fully apprised as
          to the  status of the  defense  or any  settlement  negotiations  with
          respect  thereto.  No  Indemnifying  Party  shall  be  liable  for any
          settlement  of any action,  claim or proceeding  effected  without its
          written consent,  which consent shall not be unreasonably withheld. No
          Indemnifying  Party  shall,  without  the  consent of the  Indemnified
          Party,  consent to entry of any judgment or enter into any  settlement
          or other compromise  which does not include as an  unconditional  term
          thereof the giving by the claimant or  plaintiff  to such  Indemnified
          Party of a release  from all  liability  in  respect  to such claim or
          litigation.  Following  indemnification as provided for hereunder, the
          Indemnifying   Party  shall  be   subrogated  to  all  rights  of  the
          Indemnified  Party  with  respect  to  all  third  parties,  firms  or
          corporations relating to the matter for which indemnification has been
          made. The failure to deliver written notice to the Indemnifying  Party
          within a reasonable time of the  commencement of any such action shall
          not  relieve  such   Indemnifying   Party  of  any  liability  to  the
          Indemnified  Party under this  Section,  except to the extent that the
          Indemnifying Party is prejudiced in its ability to defend such action.
          The indemnification required by this Section shall be made by periodic
          payments of the amount thereof during the course of the  investigation
          or  defense,  as and when  bills  are  received  or Buyer  Indemnified
          Liabilities,  NCT  Indemnified  Liabilities  or Pro  Tech  Indemnified
          Liabilities are incurred.

     e.   Limitation of  Liability.  No Buyer shall be liable to Pro Tech or NCT
          pursuant to this  Section 12 in an aggregate  amount  greater than the
          ratable  amount  of  the  Purchase  Price  relating  to the  Series  A
          Preferred Shares, the Warrants,  the Conversion Shares and the Warrant
          Shares  purchased by such Buyer.  Pro Tech and NCT shall not be liable
          to the Buyers  pursuant to this Section 12 for any amount in excess of
          the  aggregate  Purchase  Price.  No party  may  seek to  limit  their
          liability pursuant to this subsection 12(e) in the event the liability
          such party  seeks to limit  arises  from (i) such  party's  knowing or
          willful  misconduct  or  gross  negligence  or  (ii)  in the  case  of
          indemnification   by  Pro  Tech  or  NCT,  a  third   party  claim  or
          governmental  claim  arising  from Pro  Tech's or NCT's  violation  or
          alleged violation of federal or state securities laws.

     13.  GOVERNING LAW, MISCELLANEOUS.

     a.   Governing Law. THIS  AGREEMENT  SHALL BE GOVERNED BY AND CONSTRUED AND
          ENFORCED IN ACCORDANCE  WITH THE LAWS OF THE STATE OF NEW YORK WITHOUT
          REGARD TO THE PRINCIPLES OF CONFLICTS OF LAWS.

     b.   Consent  to  Jurisdiction.   The  parties  expressly  consent  to  the
          exclusive jurisdiction and venue of the federal courts whose districts
          encompass  any part of the  City of New  York,  New York or the  state
          courts of the State of New York  sitting in the City of New York,  New
          York, for the  adjudication  of any civil action related to or arising
          out of,  in whole  or in  part,  this  Agreement  and the  Transaction
          Documents.

     c.   Counterparts.  This  Agreement  may  be  executed  in  three  or  more
          identical  counterparts,  all of which  when taken  together  shall be
          considered one and the same agreement and shall become  effective when
          counterparts have been signed by each party and delivered to the other
          parties.  In the event any  signature  page is  delivered by facsimile
          transmission,  the party using such means of delivery shall cause four
          (4) additional  originally  executed  signature pages to be physically
          delivered to the other  parties  within five (5) days of the execution
          and delivery hereof.

     d.   Headings.  The  headings  of this  Agreement  are for  convenience  of
          reference   only  and  shall   not  form   part  of,  or  affect   the
          interpretation of, this Agreement.

     e.   Severability.  If any term, provision, covenant or restriction of this
          Agreement is held to be illegal, void, invalid or unenforceable in any
          jurisdiction, such invalidity or unenforceability shall not affect the
          validity or  enforceability of the remainder of this Agreement in that
          jurisdiction  or the validity or  enforceability  of any  provision of
          this Agreement in any other jurisdiction.

     f.   Entire  Agreement,  Amendments.  This  Agreement  supersedes all other
          prior oral or written  agreements  among the  Buyers,  Pro Tech,  NCT,
          their  Affiliates  and persons  acting on their behalf with respect to
          the matters discussed  herein,  and this Agreement and the instruments
          referenced herein contain the entire understanding of the parties with
          respect to the matters covered herein and, except as specifically  set
          forth  herein,   neither  Pro  Tech,  NCT  nor  any  Buyer  makes  any
          representation, warranty, covenant or undertaking with respect to such
          matters. No provision of this Agreement may be waived or amended other
          than by an instrument in writing signed by each of the parties hereto.

     g.   Notices.  Any  notices,  consents,  waivers,  or other  communications
          required or  permitted  to be given under the terms of this  Agreement
          must be in writing and will be deemed to have been  delivered (i) upon
          receipt,  when delivered  personally;  (ii) upon receipt, when sent by
          facsimile,  provided a copy is mailed by U.S.  certified mail,  return
          receipt  requested;  (iii)  three (3) days  after  being  sent by U.S.
          certified mail,  return receipt  requested;  or (iv) one (1) day after
          deposit with a nationally  recognized  overnight delivery service,  in
          each case  properly  addressed  to the party to receive the same.  The
          addresses and facsimile numbers for such communications shall be:

      If to NCT:              20 Ketchum Street
                              Westport, Connecticut 06880

                              Attention: Chief Financial Officer

                              Telephone:  (203) 226-4447
                              Facsimile:  (203) 226-4338

      With a copy to:         William P. O'Neill, Esq.
                              Crowell & Moring LLP
                              1001 Pennsylvania Avenue, NW, 10th floor
                              Washington, DC  20004-2595

                              Telephone:  (202) 624-2603
                              Facsimile:  (202) 628-5116

      If to Pro Tech:         Pro Tech Communications, Inc.
                              3311 Industrial 25th Street
                              Ft. Pierce, Florida  34946
                              Attention:  Richard Hennessey, President

                              Telephone:  (561) 464-5100
                              Facsimile:  (561) 464-6644

      With a copy to:         Leslie J. Croland, P.A.
                              Steel Hector & Davis LLP
                              200 South Biscayne Boulevard, 41st Floor
                              Miami, Florida 33131

                              Telephone:  (305) 577-7095
                              Facsimile:  (305) 577-7001


     If to the Buyers,  to their address and  facsimile  number on the signature
     page hereof, with copies to the Buyers' counsel as set forth in a notice to
     Pro Tech and NCT.

     h.   Successors and Assigns. This Agreement shall be binding upon and inure
          to  the  benefit  of  the  parties  and  their  respective   permitted
          successors  and  assigns.  None  of  the  parties  shall  assign  this
          Agreement  or any rights or  obligations  hereunder  without the prior
          written consent of the other parties.

     i.   No Third Party  Beneficiaries.  This  Agreement  is  intended  for the
          benefit  of  the  parties  hereto  and  their   respective   permitted
          successors  and  assigns,  and is not for the  benefit of, nor may any
          provision hereof be enforced by, any other person.

     j.   Survival. Unless this Agreement is terminated under Section 13(m), the
          representations  and  warranties  of Pro  Tech,  NCT  and  the  Buyers
          contained in Sections 4, 5 and 6, the  agreements  and  covenants  set
          forth in Sections 7, 8, and 13 and the indemnification  provisions set
          forth in  Section 12 shall  survive  for a period of one (1) year from
          the  Closing.  Each  Buyer  shall  be  responsible  only  for  its own
          representations, warranties, agreements and covenants hereunder.

     k.   Publicity.  Pro  Tech,  NCT and the  Buyers  shall  have the  right to
          approve  before  issuance  any  press  releases  or any  other  public
          statements  with  respect  to the  transactions  contemplated  hereby;
          provided,  however,  that  Pro  Tech or NCT  shall  each be  entitled,
          without the prior approval of the Buyers, to make any press release or
          other  public  disclosure  with  respect  to such  transactions  as is
          required by applicable law and regulations  (although the Buyers shall
          be  consulted  by Pro Tech and NCT in  connection  with any such press
          release or other public  disclosure  prior to its release and shall be
          provided with a copy thereof).

     l.   Further  Assurances.  Each party shall do and perform,  or cause to be
          done and  performed,  all such  further  acts and  things,  and  shall
          execute  and  deliver   all  such  other   agreements,   certificates,
          instruments and documents,  as the other party may reasonably  request
          in order to carry out the intent and  accomplish  the purposes of this
          Agreement  and  the  consummation  of  the  transactions  contemplated
          hereby.

     m.   Termination.  In the event that the  Closing  shall not have  occurred
          with  respect to the Buyers on or before five (5)  business  days from
          the date hereof due to Pro Tech's, NCT's or any of the Buyer's failure
          to  satisfy  the  conditions  precedent  to  Closing  as set  forth in
          Sections  9, 10 and 11 above (and a  nonbreaching  party's  failure to
          waive such unsatisfied  condition(s)),  any  nonbreaching  party shall
          have the  option to  terminate  this  Agreement  with  respect to such
          breaching  party  at the  close  of  business  on  such  date  without
          liability of any party to any other party.

     n.   Construction  of Agreement.  This Agreement has been fully  negotiated
          among the  parties,  and none of the  parties  shall have any  greater
          burden than the other parties in construing this Agreement,  including
          one party being charged with the drafting of the Agreement.
<PAGE>

     IN WITNESS WHEREOF, the Buyer, Pro Tech and NCT have caused this Securities
Purchase and  Supplemental  Exchange Rights  Agreement to be duly executed as of
the date first written above.

                          PRO TECH COMMUNICATIONS, INC.


                        By: /s/RICHARD HENNESSEY
                            -------------------------------
                             Name: Richard Hennessey
                             Its:  President and Secretary



                             NCT GROUP, INC.


                        By: /s/ CY E. HAMMOND
                            --------------------------------
                             Name: Cy E. Hammond
                             Its:  Senior Vice President and
                                   Chief Financial Officer






                       [SIGNATURES CONTINUE ON NEXT PAGE]



<PAGE>


                             "BUYER"

                             BALMORE FUNDS, S.A.

                             By:         /s/Gisela Kindle
                             Name:       Gisela Kindle
                             Title:      Director
                             Address:    Balmore Funds, S.A.
                                         Trident Chambers
                                         P.O. Box 146
                                         Proadstown, Tortola BVI

                             Telephone:(011) 4175-384-1953
                             Facsimile:(077)4175-384-1946




                             AUSTOST ANSTALT SCHAAN


                             By:         /s/Thomas Harkel
                             Name:       Thomas Harkel
                             Title:      Representative
                             Address:    Austost Anstalt Schaan
                                         744 Fuerstentum
                                         Landstrusse, 163
                                         Lichtestein

                             Telephone:(____) ___________________
                             Facsimile:(____) ___________________




                             ZAKENI LIMITED


                             By:         /s/BERNARD MULLER
                             Name:       Bernard Muller
                             Title:      President
                             Address:    Zakeni Limited
                                         Grand Bahamas

                             Telephone:(011) 4141-727-5070
                             Facsimile:(011)4141-727-5080
<PAGE>


                                   EXHIBIT "A"

               ARTICLES OF AMENDMENT TO ARTICLES OF INCORPORATION
                        OF PRO TECH COMMUNICATIONS, INC.



                                     <PAGE>


                                   EXHIBIT "B"

                          REGISTRATION RIGHTS AGREEMENT
                        OF PRO TECH COMMUNICATIONS, INC.


                                     <PAGE>


                                   EXHIBIT "C"

                          REGISTRATION RIGHTS AGREEMENT
                               OF NCT GROUP, INC.


                                     <PAGE>


                                   EXHIBIT "D"

                         WARRANT FOR BALMORE FUNDS, S.A.


                                     <PAGE>


                                   EXHIBIT "E"

                       WARRANT FOR AUSTOST ANSTALT SCHAAN





                                     <PAGE>


                                   EXHIBIT "F"

                           WARRANT FOR ZAKENI LIMITED


                                     <PAGE>


                                   EXHIBIT "G"

                                 NCT GROUP, INC.
                               NOTICE OF EXCHANGE

     Reference  is made to the  Securities  Purchase and  Supplemental  Exchange
Rights Agreement (the "Securities Purchase  Agreement").  In accordance with and
pursuant to the Securities Purchase Agreement,  the undersigned hereby elects to
exchange the number of shares of Series A Convertible  Preferred Stock, $.01 par
value per share (the "Series A Preferred Shares"),  of Pro Tech  Communications,
Inc., a Florida  corporation,  indicated below for shares of Common Stock,  $.01
par value per share, of NCT Group,  Inc. (the "NCT Common Stock"),  by tendering
the stock certificate(s)  representing the share(s) of Series A Preferred Shares
specified below as of the date specified  below,  based on the Exchange Rate set
forth in Section 3(b) of the Securities Purchase Agreement.

     The  undersigned  acknowledges  that any  sales by the  undersigned  of the
securities  issuable to the undersigned  upon exchange of the Series A Preferred
Shares shall be made only  pursuant to (i) a  registration  statement  effective
under the Securities Act of 1933, as amended (the "Act"),  or (ii) an opinion of
counsel in form and content reasonably satisfactory to the Corporation that such
sale is exempt from registration required by Section 5 of the Act.

     Date of Exchange:

     Number of Series A Preferred Shares to be exchanged:

     Stock certificate no(s). of Series A Preferred Shares to be exchanged:

     Please confirm the following information:

     Exchange Price:

     Number of shares of NCT Common Stock to be issued:

Please  issue the NCT Common  Stock for which the Series A Preferred  Shares are
being exchanged in the following name and to the following address:

     Issue to:1

     Facsimile Number:



<PAGE>


                                   EXHIBIT "H"

                              OPINION OF COUNSEL OF
                                 NCT GROUP, INC.



<PAGE>


                                   EXHIBIT "I"

                              OPINION OF COUNSEL OF
                          PRO TECH COMMUNICATIONS, INC.



<PAGE>


                                   EXHIBIT "J"

                                BOARD RESOLUTIONS

<PAGE>


                               SCHEDULE OF BUYERS


<PAGE>

                                  SCHEDULE 4(n)

                                Buyers: Conflicts


<PAGE>


                                  SCHEDULE 5(c)

                           Pro Tech: Capitalization

<PAGE>


                                 SCHEDULE 5(e)

                              Pro Tech: Conflicts


      None.

<PAGE>

                                  SCHEDULE 5(f)

                         Pro Tech: Defaults, Violations


<PAGE>


                                 SCHEDULE 5(g)

                               Pro Tech: Consents

<PAGE>


                                 SCHEDULE 5(i)

                           Pro Tech: Subsequent Events


<PAGE>


                                 SCHEDULE 5(j)

                             Pro Tech: Litigation
<PAGE>


                                 SCHEDULE 5(p)

                                 Pro Tech: Title

<PAGE>


                                 SCHEDULE 5(u)

                             Pro Tech: Tax Status

<PAGE>


                                 SCHEDULE 5(v)

                        Pro Tech: Certain Transactions

<PAGE>

                                 SCHEDULE 6(c)

                              NCT: Capitalization

<PAGE>

                                 SCHEDULE 6(e)

                                NCT: Conflicts


      None.


<PAGE>


                                  SCHEDULE 6(f)

                            NCT: Defaults, Violations

<PAGE>


                                 SCHEDULE 6(g)

                                  NCT: Consents

<PAGE>


                                 SCHEDULE 6(i)

                             NCT: Subsequent Events

<PAGE>


                                 SCHEDULE 6(j)

                                NCT: Litigation


<PAGE>


                                 SCHEDULE 6(p)

                                   NCT: Title


<PAGE>


                                 SCHEDULE 6(u)

                                NCT: Tax Status



<PAGE>


                                 SCHEDULE 6(v)

                           NCT: Certain Transactions






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