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First Alert Powered Alarm SCO5CN Combination Smoke and Carbon Monoxide Detector, Battery Operated, 1 Pack, White - Combination Smoke Carbon Monoxide Detectors - Amazon.com
Carbon Monoxide Detector,CO Alarm Monitor Detector Complies with UL 2034 Standard for Home,Carbon Monoxide Sensor with LCD Digital Display and Sound Warning for Home - Amazon.com
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First Alert Z-Wave Enabled Battery Smoke & Carbon Monoxide Combo Alarm : ZCOMBO-G - New Price Inc