BRK Electronics 9120B Smoke Alarm AC 120V Interconnectable Ion w/ Battery Back up (Lot of 12)

Introducing the revolutionary BRK 9120 series smoke alarms which have been redesigned from the ground up. They install faster perform better and are even smarter than before. All of these improvements help reduce nuisance alarms and save you time and money. BRK Electronics smoke alarms are designed to be easy to install easy to maintain and quality-engineered for years of virtually maintenance-free service. The 9120B AC-powered smoke alarm with battery backup includes these features: ionization sensor which helps detect fast flaming fires that consume combustible materials rapidly. 120-Volt AC inter-connectable (with maximum 18 compatible devices). the alarm can be interconnected with up to 12 other compatible smoke alarms and six compatible devices like bells horns repeaters and door closers. If one unit triggers an alarm all smoke alarms in the series will sound. Power indicators show which unit in the series initiated the alarm. Latching alarm indicator which automatically id