gas detector alarm 1)Detecting gas: LPG, natural gas, and coal gas 2)Power supply: AC100V AC240V 3)Power frequency: 50/60Hz 4)Rated load: <3.5W 5)Alarm thickness: LPG: 0.1 0.5%; natural gas: 0.1 0.3%; coal gas 0.1 0.5% 6)Alarm volume:≥20dB 7)Working environment: -1050 relative humidity <97RH 8)Storage temperature: -25°C 55°C