1.Built-in sensor, detect the gas leak more precise and quickly (Range: 50 to 1000ppm). This sensor can reduce the warm-up time to 28s before testing gas leak like: propane, methane, natural gas, coal gas, gasoline, Hexane, butane, benzene, ethyene oxide, acetylene, LPG, LNG, etc. 2.Include a lanyard with ring, it is convenient to take it anywhere when you need to detect combustible gas devices like kitchen gas stove, water heater, natural gas heating system, RV propane tanks, factory gas pipelines, camping stove, picnic etc. 3. find out the gas leak point accurately and quickly. Turn on the detector in a clear environment and finish the warm-up process , then Click "Hi" button to find the leakage range, then click "Lo" button to locate the gas leak point, perfect safety tool . Specifications: A:Contains Battery Colour:White Material:ABS Package Contents: 1 x combustible gas detector (including 2 AAA batteries) 1 x Chinese and English instruction manual 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.