Built-in sensor, detect gas leaks more precisely and faster (range: 50 to 1000ppm). This new sensor reduces the warm-up time to 28 seconds before testing for gas leaks such as: Propane, Methane, Natural Gas, Coal Gas, Gasoline, Hexane, Butane, Ethylene Phenoxide, Ethylene Propane, LNG and more. Including a lanyard with loop, you can take it with you when you need to detect gas appliances. With this high and low mode, accurately and quickly find the gas leak point. Turn on the detector in a clear environment, complete the warm-up process within 28 seconds, then click the "Hi" button to find the leak range, and then click the "Lo" button to find the gas leak point, the perfect safety tool . When gas leak is detected, the progress bar will turn red display on the 1.1inch HD screen, and the alarm will continue to "di di di". When the battery is low, a low battery will appear on the screen. Our gas leak detector will automatically shut off within 5 minutes. 2 AAA batteries with 100+ working hours. Colour:B:Black Material:ABS Package Contents: 1set * gas alarm detector for home 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.