It is designed for hardwired installation but features a 10-year battery backup that allows the unit to function in the event of a power outage. The CO smoke detector can be connected to other compatible BRK or First Alert CO smoke detectors within a single-family residence. A single button silences or tests the unit.
First Alert Direct Wire Combination Smoke and Carbon Monoxide Detector, 120 Volt with 9 Volt Battery Back Up SC9120B 6 Pack
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