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FIRST ALERT BRK SC9120FF Hardwired Smoke and Carbon Monoxide (CO) Detector with Battery Backup, 1 pack , White - Amazon.com
High Sensitivity Smoke Detector | Smoke Detectors | Sensors | Smoke Detectors | Honeywell Building Solutions
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How to Install Hard Wired Smoke Detector - Easy Installation First Alert Smoke Detector Model 9120B - YouTube
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