SA521CN-3ST Interconnected Smoke Alarm with Hardwire Adapter Included

The First Alert SA520 Interconnected Smoke Alarm with Hardwire Adapter Included allows you to create an interconnected fire alarm system without the hassle of rewiring. Use this smoke detector to replace an existing hardwired smoke alarm and then install additional First Alert wireless detectors for an interconnected safety network (additional detectors sold separately). This hardwired smoke and fire detector can connect and communicate with up to 18 compatible alarms, so when one is triggered, the entire system will sound. Equipped with battery backup, this smoke and fire alarm provides continuous protection during power outages.

• When one alarm is triggered, all connected alarms will sound
• Battery backup provides continuous detection during power outages
• Hardwired smoke detector can communicate wirelessly with other compatible alarms to create a fire alarm system (additional alarms sold separately)