GS517 Hardwired Connected Smoke Alarm

Hardwired Smoke Detector： Hardwired interconnected smoke alarm, can connect up to 12 alarms. It is more precise and stable than wireless interconnection. Interconnection Test： If the fire detectors are interconnected, you only need to press one test button during the weekly test, and the rest can be tested at the same time. 9V Battery Backup： The fire alarm is powered by a 120V power and a 9V backup battery. The alarm battery will last for at least 1 year, providing protection in the event of a power outage.