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FIRST ALERT Hardwired Wireless Smoke Alarm with Photoelectric Sensor and Battery Backup, SA521CN-3ST , White - Smoke Detectors - Amazon.com
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First Alert Battery Powered SCO500B Wireless Interconnected Photoelectric Smoke and Carbon Monoxide Combo Alarm with Voice and Location - Combination Smoke Carbon Monoxide Detectors - Amazon.com
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First Alert SA521CN-3ST Wireless Interconnect Hardwired Smoke Alarm | First Alert
