ABOUT NATIONAL SECURITY & ALARM INSTALLERS National Security & Alarm Installers, Co. Ltd. is an American Licensed and Registered Service and Installation company, based in Queens, New York – USA. Safety and Security of lives and properties are what we do and care for 24 Hours, 7 Days a week. We connect the wires, devices, and program the whole systems very fast and professional. We serve the following county and states: New York State: Queens / Brooklyn / Bronx/ Manhattan / Long Island/Upstate-New York / New Jersey / Philadelphia / Delaware/Connecticut. We use only the latest Technology and Brand Names in all our CCTV-Cameras, Burglar-Alarms, Access Control (Parking-Lot Gates, Subway Turnstile, Building Access Entry Points, Toll Gates, etc.