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FEATURES: Power Source=(3) AA Batteries, Batt. Size=AA, Sensor Type=Ionization, Fuel Cell, Sound Level=85 dB, Temp. Range=40.0 ?F [Min], 100.0 ?F [Max], Dia.=5 in, Depth=1 1/2 in Talking Alarm: Announces the hazard type detected thereby helping to speed up the correct reaction to the hazard detected Test/Reset Button: Tests alarm circuitry and triggers the voice announcement LEDs: Two LEDs are provided Low Battery Warning: The unit warns of a low battery condition Battery Safeguard: Ensures the unit cannot be accidentally mounted without batteries installed