First Alert SCO403 Alarm Combination Pack

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Includes battery-operated carbon monoxide alarm and battery-operated smoke alarm Modern, compact CO detector design with no installation required, electrochemical sensor Smoke alar m uses ionization smoke sensing technology Simple to use silence/test button, low battery warning, end-of-life timer, 85 decibel alarm Two AA batteries included for the CO and 9-volt for the smoke alarm, 5-year limited warranty Show more