<DOCUMENT>
<TYPE>EX-21
<SEQUENCE>4
<FILENAME>y40822ex21.txt
<DESCRIPTION>SUBSIDIARIES OF THE REGISTRANT
<TEXT>

<PAGE>   1
                                                                      EXHIBIT 21

                           SUBSIDIARIES OF THE COMPANY

       The following are the Company's subsidiaries as of the close of the
fiscal year ended June 30, 2000. All beneficial interests are wholly-owned,
directly or indirectly, by the Company and are included in the Company's
consolidated financial statements.

<TABLE>
<CAPTION>
                                                                      State or
                                                                  Jurisdiction of
           Name                                                    Organization
           ----                                                   ---------------
<S>                                                               <C>
Alarm Lock Systems, Inc.                                              Delaware

Napco Security Systems International, Inc.                            New York

Napco/Alarm Lock Exportadora, S.A.                                    Dominican
                                                                      Republic

Napco/Alarm Lock Grupo Internacional, S.A.                            Dominican
(formerly known as NSS Caribe, S.A.)                                  Republic

Napco Group Europe, Limited                                           England
</TABLE>


                                       E-3

</TEXT>
</DOCUMENT>