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Siemens FDOOTC441 Multi-Criteria Fire / CO Detector
USI Hallway 10 Year Smoke and Carbon Monoxide Detector
Siterlink Smoke Detector Carbon Monoxide Detector Combo with LCD Display, 2 in 1 Fire and CO Detector Alarm with LED Indicator & Test Button, Battery Operated, UL 217 & UL 2034 Standards, 1 Pack - Amazon.com