High Sensitive Stand Alone Smoke Alarm Fire Detector

Specification:
1). Power Source: 9V Battery (included).
2)Audio Alarm: ≥ 85dB/3m
3)Temperature Range: 0 to 40degree
4)Humidity Range: 5%-95% relative humidity(RH)
5)Sensor: Photoelectric
6)Size: Diameter 105mm in diameter x59mm depth
7)Interconnects: Yes
8)Easy to install with mounting base included
9)Suitable for any room
10)Low battery signal
11)Test button for simple testin