Fire-Lite Alarms by Honeywell H-355R -W-H355 and W-H355R addressable, wireless heat detectors use a state-of-the-art thermistor sensing circuit for a fast response. The W-H355 and W-H355R provide fixed temperature alarm detection at 135F. The W-H355R also providing Rate-of-Rise Detection at 15F/min. These detectors are designed to provide open area protection and are intended to use with the MS-9200UDLS and MS-9600(UD)LS Addressable Fire Alarm Control Panels. The W-H355 and W-H355R communicate with the fire alarm control panels through a wireless mesh network to the W-GATE wireless gateway.- State-of-the-art thermistor technology for fast response.- Factory preset at 135F (57C) for the W-H355 and W-H355R.- Rate-of-rise triggers at 15F (8.3C) per minute for the W-H355R.- Cascading Mesh Wireless Technology (902-928 MHz frequency).- Any wireless device can be added to act as a repeater.- Requires (4) CR-123A batteries (included).