First Alert BRK 3120B Hardwired Smoke Detector with Photoelectric and Ionization with Battery Backup
Smoke alarm is efficiently designed to utilize both ionization and photoelectric smoke sensors to detect both flaming and smoldering fires in their earliest stages. Contains a single test/silence button and two latching features; low battery latch and alarm latch. Powered by a 2AA battery back-up. Product is ULC listed and includes a 10 year limited warranty.
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