First Alert BRK 9120B Hardwired Smoke Alarm with Battery Backup

Keep your family safe with this hardwired smoke alarm the battery backup means constant monitoring, even if there's a power failureEquipped with an ionization sensor, this smoke alarm reliably detects smoke from fast flaming fires and alerts you with an 85 decibel alarmTo ensure complete protection make sure to place one on each level of your home and in each bedroomCan connect to other compatible BRK or first alert smoke detectors, to ensure all alarms will sound when smoke is detectedSimple to use, with a single test/silence button, and side load battery compartment tamper resistant locking brackets and universal mounting brackets make installation easyRigorously tested to meet UL standards120 volt AC power with 9V battery backup to keep alarm functioning during power outageFirst Alert has been the most trusted brand in home safety since launching the first residential smoke alarm in 1958 (Based on a First Alert Brand Trust Survey in February 2018)Faster turnarounds on job sites with