Amazon: First Alert Smoke Detector Hardwired w/ Battery Backup Only $9.78 Shipped (Regularly $24)
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This First Alert Smoke Detector is hardwired with a backup battery and is equipped with an ionization sensor that detects smoke from fast-flaming fires and alerts you with an 85-decibel alarm.
On the fence?
Check out the over 3,000 reviews that give this smoke alarm a 4.5 out of 5 star rating.