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First Alert SC9120B Hardwire Combination Smoke/Carbon Monoxide Alarm with Battery Backup | First Alert
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Nighthawk™ AC Plug-in Operated Carbon Monoxide Alarm with Digital Display - ND Safety Council
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SITERLINK Carbon Monoxide Detectors Battery Operated, CO Detector with Test-Silence Button, 7-Year UL Listed Carbon Monoxide Alarm with Electrochemical Sensor, GS811-A, 2 Packs - Amazon.com
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Help Me Hank: Testing carbon monoxide detectors
Smoke and Carbon Monoxide Alarms | Mass.gov
First Alert Battery Electrochemical Carbon Monoxide Alarm
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