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First Alert SC9120B Hardwire Combination Smoke/Carbon Monoxide Alarm with Battery Backup | First Alert
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Universal Security Instruments Plug-In, 2-In-1 Carbon Monoxide and Natural Gas Detector, Display Screen, Battery Backup, Microprocessor Intelligence MCND401B - The Home Depot
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First Alert SC9120B Hardwire Combination Smoke/Carbon Monoxide Alarm with Battery Backup | First Alert
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