United has been protecting life and property in New York City since 1945. FDNY certified and approved central monitoring station. UL and NICET-certified monitoring in the heart Soho. We offer a full array of services that are technologically advanced: Intrusion, Fire, Video Surveillance, Access Control, Safe & Hold-up, Personal Security, and 24/7 Certified Central Station Monitoring in NYC. United Security Systems can design, install, and monitor a high-tech intrusion detection system that will give you peace of mind knowing your home or business is protected. FDNY APPROVED UNITED specializes in the installation of commercial fire alarms for high-rise buildings and hotels as well as retail stores, restaurants, & shops. Fire alarm system design, installation and monitoring. Inspections, maintenance, service.