Hard-Wired w/Battery Back-Up Ionization Smoke and Carbon Monoxide Detector

First Alert BRK SMICO100-AC, Interconnect Hardwire Combination Smoke & Carbon Monoxide Alarm with Battery Backup. BRK's Precision Detection advanced sensing technology reduces cooking nuisance alarms and delivers early warning. Smart Interconnect, interconnects with most First Alert and BRK hardwired alarms. When one alarm sounds, all compatible alarms sound (up to 12 smoke alarms and 6 other CO/heat alarms).. Test/Silence Button, temporarily silence or test the alarm with one-touch easy access button. Interconnects with most First Alert and BRK alarms so when one sounds, all compatible alarms sound to provide an early warning. Battery backup provides continuous protection during power outages. Perfect mount bracket keeps the alarm secure over a wide rotation range for ideal alignment and easy installation. Latching Alarm Indicator visually identifies the unit that initiated the alarm or low battery warning. Direct wire-in with 9V battery backup. Hardwired with battery backup for protection during power outages.. Dust cover, keeps the alarm clean during construction