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First Alert BRK 7010B Hardwired Smoke Detector with Photoelectric Sensor and Battery Backup , White - Smoke Detectors - Amazon.com
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Wireless Interconnected Smoke Detectors with Photoelectric Sensor, Fire Alarms Smoke Detector 10 Year Battery Operated with Low Battery Indictor & Silence Button, GW111-H01, 4 Packs - Amazon.com
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