First Alert 3120BA Dual Sensor Smoke Alarm 120VThe First Alert 3120BA Dual Sensor Smoke Alarm combines photoelectric and ionization technologies to provide reliable detection of both smoldering and fast flaming fires. Hardwired for continuous protection, it includes a battery backup to ensure functionality during power outages. An easy access test button simplifies regular maintenance, while advanced latching features indicate low battery and alarm origins. Ideal for residential use, this smoke
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