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First Alert BRK SC9120B-6 Hardwired Smoke and Carbon Monoxide Detector (CO) with Battery Backup. 6-Pack , White - Amazon.com
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First Alert Battery Operated 9V Electrochemical Carbon Monoxide Alarm (6-Pack) - Power Townsend Company
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First Alert 10-Year Battery Operated 3V Electrochemical Multi-Function Carbon Monoxide Alarm - CHC Home Center
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