First Alert Sealed Battery Photoelectric Slim Round Smoke Alarm

Slim photoelectric smoke alarm with 10-year battery helps protect homes by providing up to a decade of uninterrupted monitoring. Uses an ultra-reliable photoelectric sensor to detect smoke from slow-burning, smoldering fires. Half as thick as a standard alarm, features a slim, contemporary design that mounts unobtrusively on a wall or ceiling. A built-in 10-year lithium-ion battery provides continuous power, with no need to ever worry about changing the battery over the lifetime of the smoke detector. Type: Battery Operated Voltage: 3V Battery Life: 10 Yr. Battery Sensor Type: Photoelectric Dimensions: 5-1/4 In. W x 1.19 In. H x 5-1/4 In. L Battery Back-up: Battery Only Alarm Type: Smoke Decibel Level: 85 dB Battery Type: 3V Lithium Battery Batteries Included: Yes Color: White Certification: Warranty: 10-Year Limited