AP388 Gas Leak Detector Digital Natural Gas Leak Sensor with Indicator Light Wide Range and High Accuracy for Gas Testing Item Type: Gas Leak Detector Model: AP388 Material: ABS Battery: 2 x 1.5V AA (battery not included) Purpose: Suitable for gas and natural gas leak detection in households, catering industry, factories, industrial places. Detection Gas: natural gas (Gas-CH4), liquefied gas (LPG) and other combustible gases Power on self test time: <25 seconds Alarm response range: ≥500PPM (CH4 methane) red light is on Response Time: <20 seconds Alarm Mode: red light on, sound alarm fault indication: yellow light on Low Battery Indicator: flashing green Working Temperature: 0℃~40℃ Working humidity: 10%RH~90%RH