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First Alert SC9120B Hardwired Smoke & Carbon Monoxide Combination Alarm With Battery Backup: Carbon Monoxide & Smoke Detectors (029054513069-2)
First Alert BRK 6-Pack Hardwired Combination Smoke and Carbon Monoxide Detector in the Combination Smoke & Carbon Monoxide Detectors department at Lowes.com
BRK SCO2B Smoke and Carbon Monoxide CO Detector White Security | eBay
BRK Electronics SCO2B Smoke and Carbon Monoxide Alarm with 9V Battery - Walmart.com