First Alert SA520B Smoke Alarm, 120V AC/DC

BRK First Alert SA520 Model Single/multi station smoke alarm-bridge unit is perfect for use in residential and institutional applications including sleeping rooms of hospitals, hotels, motels, dormitories and other multifamily dwellings. Alarm in white color, measures 5 Inch Dia x 2 Inch. It has noise level of 85 DB at 10 ft. Alarm incorporates photoelectric smoke sensor that is effective at detecting particles produced by flaming fires. It employs Optipath 360 technology to offer 360 degree of direct access to the smoke sensor. This alarm automatically resets when smoke clears. It provides audible sound for power up indication and low battery indication. This hardwired interconnect and RF interconnect enabled alarm supports interconnection with smoke, carbon monoxide, heat alarms and relays via wired and/or wireless communication. It has two 1.5-Volt AA alkaline battery backup for reliable operation. This alarm supports mounting on wall and ceiling for making installation easier. It withstands temperature of 40 to 100 deg F. Alarm is UL/CSFM listed and meets NFPA standards.