First Alert Hard-Wired w/Battery Back-up Electrochemical/Ionization Smoke and Carbon Monoxide Detector - Walmart.com
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SITERLINK Smoke Detectors Battery Operated, Smoke Alarm with Test-Silence Button, Photoelectric Sensor Fire Alarms Smoke Detectors with LED Lights, UL Listed Fire Alarm for House, GS528A, 4 Packs - Amazon.com