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First Alert Hardwired 120V Electrochemical/Ionization Carbon Monoxide and Smoke Alarm (6-Pack) - Henery Hardware
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BRK 7030BSL 120V AC Smoke and Carbon Monoxide Alarm with LED Strobe and 10-Year Sealed Lithium Battery Backup
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First Alert BRK SC-9120B Hardwired Smoke and Carbon Monoxide (CO) Detector with Battery Backup - Combination Smoke Carbon Monoxide Detectors - Amazon.com
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First Alert Hardwired 120V Electrochemical/Ionization Carbon Monoxide and Smoke Alarm - Carr Hardware
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