we use new and safe sensor to make the products,high quality. 1.Size:(L)120×(W)75×(H)42mm2.Operating voltage: AC 220V/AC 120V/AC 110V3.Static current: ≤80mA4.Alarm current: ≤100mA5.The way of alarm: free standing acoustic-optics alarm6.Audio alarm: 70dB7.Temperature range: -10~50°C8.Humidity range: 95%RH (40±2°C)9.Suitable gas:coal gas,natural gas, petroleum liquid gas