Power Source : 120VACto 220VAC, 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