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FIRST ALERT BRK 3120B-6 Hardwired Smoke Detector with Photoelectric and Ionization with Battery Backup, 6-Pack , White - Amazon.com
First Alert Hard-Wired w/Battery Back-up Ionization/Photoelectric Dual Sensor Smoke Detector - Ace Hardware
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First Alert BRK 3120B Hardwired Photoelectric and Ionization Smoke Alarm with Battery Backup, 85 Decibels - Walmart.com
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