Homeowner, a techie, Mr. Fix-it
I purchased three of these smoke alarms to replace the existing smoke alarms in my home. The old ones were only single sensor and did not have battery backup. I choose these smoke alarms because I wanted the dual sensors (photoelectric and ionization) with a battery backup. The two types of sensors are supposed to aid in the detection of both fast burning and slow smoldering fires. I wanted battery backup because we regularly lose power and my old smoke detectors had no battery backup and are therefore useless if the power goes out! Based on my research, this smoke alarm is the ONLY 120V...
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