First Alert BRK 9120B 10pack AC Powered Smoke Detector Alarm wBattery Backup

First Alert BRK 9120B 10pack Hardwired AC Powered Smoke Detector Alarm wBattery Backup Brand BRK MPN 10X9120B Condition New This First Alert hardwired smoke alarm includes a 9volt battery backup that continues to protect you in the event of a power failure. The detector features an ionization sensor for detection of smoke and fastflaming fires, as well as a loud, 85decibel alarm. One button silences any nuisance alarms, and also tests detector functions, while lights indicate if the alarm detects smoke. The latching alarm indicator automatically identifies which unit initiated the alarm, even after the conditions that set off the alarm have subsided. And an endoflife signal enhances your safety by letting you know when its time to replace the unit. Connect it to compatible BRK or First Alert alarms within a singlefamily residence. When one alarm is triggered, all connected alarms will sound.