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The American Sensors model 770LBX (cat. no. SA773CN) is a premium 120 Volt AC/DC Hardwired smoke alarm utilizing Dual-ionization and Photoelectric sensing technology. This unique smoke alarm provides double protection as it senses both flaming and smoldering burning fires in their earliest stages and can be interconnected up to 18 units. The 9V alkaline battery back-up ensures protection in the event of a power failure. The combination of these features makes the model 770LBX suitable for installation in any room of the residence for exceptional protection.