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For those who want a comprehensive detection system without hiring an electrician or worrying about hardwiring, the First Alert SA521CN Wireless Interconnected Hardwired Photoelectric Smoke Alarm is an ideal solution. Use this smoke detector to replace an existing hardwired smoke alarm and then install additional compatible First Alert Wireless alarms for an interconnected safety network . Wireless technology makes it possible for the detector to connect with up to 18 compatible First Alert wireless-enabled alarms to create a wireless safety network. These connected alarms can communicate with each other and sound in unison. The photoelectric smoke sensor is designed to reduce false alarms from cooking smoke or shower steam while remaining sensitive to real danger. The smoke detector has an integrated battery backup in case of power outages and features a single button to silence false alarms and test the unit.
First Alert's Hard-wired Smoke Alarms alert you to potential fire dangers by detecting the presence of smoke and heat in the atmosphere.
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