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First Alert BRK SCO2B Smoke and Carbon Monoxide (CO) Detector with 9V Battery , White, 1 Pack - Combination Smoke Carbon Monoxide Detectors - Amazon.com
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Kidde Firex Plug-in Carbon Monoxide, Propane, Natural and Explosive Gas Detector, 9-Volt Battery Backup & Digital Display 21029623 - The Home Depot
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