Smoke Detectors & Smoke Alarms, Fire Alarms & Detection

The First Alert SA521CN-3ST Interconnected Smoke Alarm allows owners to create an interconnected fire alarm system without the cost and hassle of wiring. Use this smoke detector to replace an existing hardwired smoke alarm and then install additional First Alert Wireless alarms for an interconnected safety network additional alarms sold separately. This hardwired smoke detector can connect and communicate with up to 18 compatible alarms so when one alarm is triggered the entire system reacts.

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