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Power Source: 90VAC~ 270VAC, Battery backup (included).

Audio Alarm: ≥ 85dB/3m

Temperature Range: 0℃ to 40℃

Humidity Range: 5%-95% relative humidity(RH)

Sensor: Photoelectric

Size: diameter 105mm in diameter x59mm depth

Easy to install with mounting base included

Suitable for any room

Low battery signal

Test button for simple testing