EXHIBIT 21 SUBSIDIARIES OF THE COMPANY The following are the Company's subsidiaries as of the close of the fiscal year ended June 30, 2002. All beneficial interests are wholly-owned, directly or indirectly, by the Company and are included in the Company's consolidated financial statements. State or Jurisdiction Name of Organization ---- --------------- Alarm Lock Systems, Inc. Delaware Continental Instruments, LLC New York Napco Security Systems International, Inc. New York Napco/Alarm Lock Exportadora, S.A. Dominican Republic Napco/Alarm Lock Grupo Internacional, S.A. Dominican Republic (formerly known as NSS Caribe, S.A.) Napco Group Europe, Limited England E-2