EXHIBIT 99.4
    


                            VIDEO SENTRY CORPORATION
                               6365 Carlson Drive
                          Eden Prairie, Minnesota 55346



   
                    NOTICE OF SPECIAL MEETING OF SHAREHOLDERS
                                February 6, 1997

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

         A Special  Meeting  of  Shareholders  of Video  Sentry  Corporation,  a
Minnesota  corporation  ("Video"),  will be held  starting at 10:00 a.m.,  local
time,  on February 6, 1997,  at the offices of Winthrop &  Weinstine,  3000 Dain
Bosworth  Plaza,  60 South  Sixth  Street,  Minneapolis,  Minnesota  (the "Video
Meeting").  Attendance at the Video Meeting will be limited to  shareholders  of
record on January 10, 1997, or their proxies, beneficial owners having evidenced
ownership on that date, and invited guests of Video.

    

         The purposes of the meeting are:

                  1. To consider and vote upon a proposal (the "Video Proposal")
         to approve  and adopt an Amended  and  Restated  Agreement  and Plan of
         Reorganization and Merger, dated as of November 27, 1996, as amended by
         Amendment  No.  1  to  Amended  and  Restated  Agreement  and  Plan  of
         Reorganization and Merger,  dated as of January 10, 1997 (collectively,
         the "Merger  Agreement"),  among  Video,  Knogo North  America  Inc., a
         Delaware  corporation  ("Knogo"),   Sentry  Technology  Corporation,  a
         Delaware  corporation  ("Sentry"),  Viking  Merger  Corp.,  a Minnesota
         corporation  and a  wholly-owned  subsidiary of Sentry  ("Video  Merger
         Corp."),   and  Strip  Merger  Corp.,  a  Delaware  corporation  and  a
         wholly-owned  subsidiary of Sentry ("Knogo Merger  Corp.").  The Merger
         Agreement contemplates, among other things, that (a) Video Merger Corp.
         will be merged  with and into Video,  and Knogo  Merger  Corp.  will be
         merged with and into  Knogo,  with the result that Video and Knogo each
         will become  wholly-owned  subsidiaries of Sentry, (b) each outstanding
         share of Video common stock,  par value $0.01 per share ("Video  Common
         Stock"),  will be  converted  into the  right to  receive  one share of
         Sentry  common  stock,  par  value  $0.001  per share  ("Sentry  Common
         Stock"),  and (c) each outstanding 1.2022 shares of Knogo common stock,
         par value $0.01 per share,  will be converted into the right to receive
         one share of Sentry  Common  Stock plus one share of Class A  Preferred
         Stock of Sentry, par value $0.001 per share; and

                  2. To transact such other business as may properly come before
         the Video Meeting or at any adjournments or postponements thereof.

         The terms of the  Video  Proposal  and the  Sentry  Common  Stock to be
issued in connection therewith are described in detail in the accompanying Joint
Proxy  Statement/Prospectus.  To ensure that your vote will be  counted,  please
complete,  date and sign the  enclosed  proxy card and return it promptly in the
enclosed  postage-paid  envelope,  whether  or not you plan to attend  the Video
Meeting.  You may revoke your proxy in the manner  described in the accompanying
Joint  Proxy  Statement/Prospectus  at any time  before it is voted at the Video
Meeting.

         Holders  of  record of  shares  of Video  Common  Stock at the close of
business  on January  10,  1997,  the  record  date for the Video  Meeting,  are
entitled to notice of and to vote at the Video  Meeting or at any  postponements
or adjournments  thereof.  The affirmative  vote of the holders of a majority of
the  outstanding  shares of Video  Common Stock is required to approve the Video
Proposal.

                                            By Order of the Board of Directors

                                            Ronald W. McClurg
                                            Secretary
Eden Prairie, Minnesota
   
January 23, 1997
    




                                    IMPORTANT

         Whether or not you plan to attend the Video  Meeting in person,  please
complete,  sign, date and return the enclosed Proxy Card as soon as possible.  A
return envelope is provided for your  convenience.  You may revoke your Proxy at
any time  before it is voted by  delivering  to the  Secretary  of Video at 6365
Carlson Drive, Eden Prairie,  Minnesota 55346 a signed notice of revocation or a
later dated signed Proxy Card or by  attending  the Video  Meeting and voting in
person.

           DO NOT SEND IN ANY STOCK CERTIFICATES WITH YOUR PROXY CARD.