1.Battery Operated

2.Photoelectric Sensing Technology
3.Low Battery alarm function available.
4.Loud 85dB Alarm
5.Instant test button available
6.Operating voltage: DC9V
7.Interconnects function available.
8.Alarm sound : 85dB at 10ft
9.operating temperature: -10℃~+70℃
10.Humidity: 5%-95% RH
11.Smoke Alarm Point: 2.06%/ft
12.Alarm temperature: 57℃ (135°F)
13.Dimension: 115 mm(Dia)*47mm(H)