Strobe Light, Features 177 Candela LED Strobe Light Provides Visual Warning Intended to Waken Hearing Impaired Residents, 1Hz Flash Rate, Smart Strobe - Separate Flash Patterns to Distinguish Between Smoke and Carbon Monoxide, Strobe Signal Synchronization - When Multiple Units Installed, Strobes Flash In Unison, Includes Dust Cover, Quick-Connect Wiring Harness, Twist-Lock Mounting Bracket, Power Source Hardwired, Product Type Strobe Light, For Use With Residential or Commercial Detectors