Detect Various Flammable Gases: Portable Natural gas sniffer and tester is used to locate exact gas leak for various combustible gas, such as methane, natural gas, propane, LPG, sewer gas, coal gas, gasoline, other flammable gases Detection Range: Approximately 50 to 10,000 ppm (Based on Methane), instant response once encounter leakage points Easy-to-Use Gas Leak Detector: Powered by 3 AAA batteries (Not included), 12 inch bendable gooseneck can locate and detect the gas leaks even in hard-to-reach areas at home & VR, kitchen and fireplace etc., refer to How and Where to Use the Y201 Combustible Gas Detector video Sound and Visual Gas Alarm: Six red LEDs (visual) and 85dB audible alerts once encounter gas leakage along pipeline or around the suspected leakage points Original Design and Lifetime Technical Support: Design patent and certifications are applied to make sure the product quality and uniqueness. How to use? 1Warm up process: around 10s The speaker will always have di didi until we turn off device, except one moment in step 2.2. At warm up period, ticking noise frequency is slow: around 2~3 times/s. The knob is used to adjust sensitivity of detector after finish 10s warm up process, during the process, no matter how to adjust the knob, the device won't have any reactions. 2Rotate the knob to adjust sensitivity If the alarm sounds prematurely and LED lights are on after warm up, need to decrease sensitivity to prevent false alarm (dial downward "-", shown as red arrow) . Rotate the knob to adjust sensitivity until the first bottom LED turn off or at the threshold of lighting up, and the moment that ticking sound stops. This is the best status. But if it's inconvenient to get the best status, we can just make the first bottom LED be on and have slow ticking "di di...." sound. Because once encounter leakage, all the rest 4~5 LED will be triggered on together at just one moment. 3Ready to sniff or trace leakage Move the probe along pipeline or around the suspected leakage points, such as fittings, connectors and switches, once encounter gas leakage, all 5~6 LED lights will be triggered immediately and the low frequency (2~3 times/s) ticking will change into piercing sounds (frequency 6~7 times/s, too fast and human ears cannot distinguish one time by one time) .