First Alert 3120B Smoke Alarm, Photoelectric Sensor, 85 dB, White Battery Chargers It's optimized for extreme adhesion

It's optimized for extreme adhesion and flexibility

Connector water flexible copper

Plastic corners form a finished window screen

For wood doors 8W x 7H

First Alert 3120B Smoke Alarm, Photoelectric Sensor, 85 dB, White Battery Chargers It's optimized for extreme adhesionHighlights: Color : White Volts : 120 volt Power Type : Hard Wired w Battery Back up Sensor Type : Ionization Photoelectric Battery Size : AA Sound Level : 85 dB Batteries Included Photoelectric and ionization sensors for comprehensive smoke and fire detection Hardwired alarm includes battery backup for power outages Single button to test detector monthly or silence during a false alarm Latching features indicate low battery or originating alarm in a