Working performance: Working voltage: AC 110~220V; Power consumption: <=2W (normal) / <=3W (alarm); Alarm concentration: Natural gas 7500ppm (15%LEL) LPG 2000ppm (10^LELE); Artificial gas: 800ppm (2%LEL); Sensor life: 5 years; Operating temperature: -10'C~50'C; Relative humidity: <=95% (non-condensing) Installation: The vertical distance of gas probe installation location and source gas stove should be greater than or equal to 50cm (because natural gas artificial gas lighter will float up in the air first gathered at the top of the room); When detection of liquefied petroleum gas the detector should be installed in the wall from the ground within at 30cm; ceiling detectors do not apply to liquefied petroleum gas detection; Detectors installation location should be away from the gas source or stove between 1.5m to 4m.