The BRK Brands, Inc. Model Number HD6135FB is a wire-in, 120V AC 60Hz single and/or multiple station heat alarm designed to supplement smoke alarms in residential and institutional applications including sleeping rooms of hospitals, hotels, motels, dormitories and other multi-family dwellings as defined in standard NFPA 101. Models HD6135FB complies with UL539, CSFM, NFPA 72, HUD, FHA and other agencies that model their codes after the above agencies. They meet building codes where AC and AC/DC with Silence heat alarms are required. The alarms are interconnectable with up to 18 devices, of which 12 can be smoke alarms. This heat alarm is not a smoke alarm nor has it been designated a life safety device. BRK Electronics HD6135FB is designed to give reliable early warning of heat from fire. It is recommended for garages, crawl spaces, bathrooms, kitchens, laundry rooms or other applications not suitable for smoke alarm installations. It features exclusive IR remote control test/silence that can be activated by most household remote controls. The unit contains a thermistor that senses heat and will alarm when either the temperature reaches 135°F or when a rate of rise of 15°F/minute is sensed by the microprocessor. This feature enables a more rapid response to a potential fire. The unit has an 85dB horn, a 9V battery backup power supply, an easy access side-load battery drawer. This alarm features Alarm Latch: Easily identifies initiating alarm even after alarm condition has subsided; Low Battery Silence: Temporarily silence the low battery chirp for up to eight hours; Alarm Silence: Silence alarm for several minutes. Two locking features are provided to prevent battery theft and/or theft of the unit. Connection to AC power is made with a Quick-Connect wiring harness. Installation is quick, easy and cost effective