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FIRST ALERT BRK SC9120B Hardwired Smoke and Carbon Monoxide (CO) Detector with Battery Backup, 1 Pack & Alert BRK 9120B-3 Hardwired Smoke Alarm with Backup Battery, 3 Pack, White, 3 Count - Amazon.com
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First Alert SCO2B Battery Operated Smoke & Carbon Monoxide Combo Alarm: Carbon Monoxide & Smoke Detectors (029054000897-2)
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