EXHIBIT 21.0 SUBSIDIARIES OF THE COMPANY The following are the Company's subsidiaries as of the close of the fiscal year ended June 30, 2004. 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. (formerly known as NSS Caribe, S.A.) Dominican Republic Napco Group Europe, Limited England E-18 E-121