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, 1998. 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 of Name Organization ---- ------------ Alarm Lock Systems, Inc. Delaware Derringer Security Systems, Inc. New York E.E. Electronic Components Inc. New York NAPCO Security Systems International, Inc. New York Napco/Alarm Lock Exportadora, S.A. Dominican Republic NAPCO/Alarm Lock Grupo International, S.A. Dominican (formerly known as NSS Caribe, S.A.) Republic NAPCO/Alarm Lock Exportadora, S.A. Dominican Republic NAPCO Group Europe, Limited England UMI Manufacturing Corp. New York E-35