Power supply: AC110-220V 2: Start warm-up current: Less than 60MA 3: Working voltage: 9~16V DC 4: Static current: Less than 40MA 5: Alarm current: Less than 150MA 6: Static consume: <1W 7: Alarm consume <2W 8: Alarm volume: More than 90dB 9: Working environment: Temperature: -15 to + 50 degree 10:Humidity: Less than 97% 11: Alarm density: Coal gas: 1000~5000ppm, Liquid petroleum gas: 1000~5000ppm, natural gas: 1000ppm~5000ppm 12: Responding time: ? 30S