The unit can detect all types of combustible gas like methane, propane, natural gas, etc. As the concentration goes up, the audible alarm beep more frequently and the scale add up. Check appliances and piping in your house to pinpoint the precise source of a potential gas leak with the practical mini gas detector. Note: *Please refer to the user manual carefully before use. *Batteries not included. *There is only the detecting parameters for methane. For the detection of other combustible gases, the parameters are only for reference. Parameters: Sensor: Gas-sensitive semi-conductor Reaction Range: gt;50PPM (methane) Warm-Up Time: Approx. 30 sec Reactions Time: Approx. 5 sec ( lt; #61;500PPM), Approx. 2 sec ( gt;500PPM) Alarm Mode: Visible and audible Operating Conditions: 0~50 / 20~80%RH Storage Conditions: -10~60 / 20~80%RH Specifications: Brand: HABOTEST Material: ABS Color: Black and Red Power: 2pcs, 1.5V, AAA battery (Batteries Not Included) Item Size: 18*3*3cm / 7.08*1.18*1.18in Item Weight: 48g / 1.69oz Package Size: 21.5*5.5*4.5cm / 8.46*2.16*1.77in Package Weight: 103g / 3.63oz Packing List: 1 * Combustible Gas Detector