First Alert BRK 3120B Hardwired Smoke Detector with Photoelectric and Ionization with Battery Backup

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Dual Photoelectric and Ionization sensing technologies for optimal sensing of smoke particles produced in both flaming and smoldering fires. Two Latching Features Two Silence Featu res Optipath 360 Technology 2 AA Batteries Included; 10 Year Limited Warranty Equipped with a dual photoelectric and ionization smoke sensor to quickly detect both fast-burning and smoldering fires Faster turnarounds on job sites with the easy-to-install, most-trusted alarms in home safety Show more