Features: Specifications: 1) Fixed size: 45mm 2) Operating voltage: DC 12V/AC 220V/AC 120V/AC 110V 3) Static current: 80mA 4) Alarm current: 100mA 5) The way of alarm: free standing acoustic-optics alarm 6) Audio alarm: 65dB 7) Temperature range: -10~50癈 8) Humidity range: 95%RH (40?癈) 9) Suitable gas:coal gas,natural gas, petroleum liquid gas