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First Alert Battery Operated Carbon Monoxide Alarm - CO400 (1039718) - 85 dB

First Alert Battery-Powered Carbon Monoxide Alarm in Black | 2.25 H x 6.75 W x 8.5 D in | Wayfair

First Alert Battery Operated 9V Electrochemical Carbon Monoxide Alarm - 1 Each

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FIRST ALERT 1039718 Battery-Powered Carbon Monoxide Alarm