The FW963 Horn Strobes, FW973 Horns and FW983 Strobes are a family of addressable multi-candela visual and audible signal appliances with light sources generated from a white LED, listed according to UL 1971, UL 1638, UL 464, ULC-S525, and ULC-S526 for indoor use. 

Each appliance has the intelligence to report its location (the device address) and status to the Fire Alarm Control Panels. Six levels of light output are selectable.  The strobe appliances produce a flash rate of one flash per second over the Regulated Voltage Range. The temporal tone generated by the horn portion is designed as per ANSI and NFPA72 for standard emergency evacuation signaling requirements. The appliance has the feature that can synchronize multiple horns/ or strobes in a complete fire alarm system.