This product is a portable combustible gas detector used toquickly and reliably detect the presence of combustible gases inthe air and to check if there is a combustible gas leak. It candetect most combustible gases that contain carbon, such asnatural gas, liquefied petroleum gas, methane, ethane, propane,carbon monoxide, etc. Using The Product: 1. Before using this device, the power button to turn it onThedevice is in a environment. 2. Start preheating immediately after the device is turned onGassensor and concentration indicator flashingDown. The deviceemits sound'di di 'indicates that the preheating process has beencompleted. 3. After preheating the sensor, bring the device to the designatedlocation You need to detect gases there. 4. Then move the sensor head closer to the possible locationlt maybe a combustible gas leak. lf the device detects combustible gasNumber and frequency of concentration indicator stripsThe alarmsound increase with the increase of gas concentration Increase. 5. After use, the power button to turn off the device. Product name:Gas Leak Detector Sensor type: semiconductor Sensor warm-up time: about Detection range: 50-1000 ppm(methane) Response sensitivity:Less than 50 ppm(methane) Response time:5 seconds (500 ppm)or 2 seconds ( 500 ppm) Alarm mode: analog display & audible alarm Power supply: 2xAAA alkaline battery (not included) Operating environment: 0 to 50/50 F to 122 F,20%-80% RH Storage environment: -10 to 60/14F to 140F,20%-80% RH Detectable gases natural gas, liquefied petroleum gas (LPG), carbon monoxide(CO)methane(CH4),ethane(C2H6), propane(C3H8), ethylene()propylene (C3H6), acetylene (C2H2), propyne (C3H4), etc. Color: White Material: plastic Package Contents: 1 * Gas Leak Detector Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.