First Alert - Smoke Alarm

Precision Detection Advanced Detection Technology Interconnects to Each Other, When One Sounds They All Sound Hardwired with Battery Backup (Batteries Included) Connects up to 12 Smoke Alarms Test and Silence Button The First Alert Precision Detection series smoke alarm. The smoke alarm is 120V AC hardwired with battery backup. Capable of wiring directly into your home electrical system. Equipped with a mute button to quickly silence your alarm as well as testing its function. The battery backup provides optimal protection in the event of a power outage. These alarms are also capable of interconnecting with up to 18 (12 smoke, 6 CO/ heat/ relay) other First Alert or BRK hardwired alarms. Features:  Advanced Precision Detection technology Precision Detection less nuisance alarms and an earlier warning to the most common types of fires In an Emergency, Every Second Count, You need to be alerted immediately if there is a danger in your home...wherever you are These alarms are also capable of interconnecting with up to 18 other First Alert or BRK hardwired alarms (12 smoke, 6 CO/Heat AAlarms/Relays) Battery Backup (Batteries Include) Alarm will continue functioning in the event of a power outage 10-year limited warranty for maximum protection Meets UL217 8th Edition Smoke Standards Product Grade: A