ULTIPLE DETECTABLE GASES: Locates combustible & explosive gas leaks from methane / natural gas, propane, fuel, ethane, butane, alcohol, coal gas, gasoline, toluene, kerosene, sewer gas, and other flammable gases.FLEXIBLE & PORTABLE GAS LEAK DETECTOR: Bend 12-inch length sensor neck in any direction along gas pipes & fuel lines or within confined spaces. Powered by 3 AAA batteries, this portable gas detector sniffer can be taken anywhere to find leaks outdoors or indoors. VISUAL / AUDIO GAS INDICATORS: 6 LEDs with 85dB alarm notify user of presence and relative concentrations of natural gas & propane leaks. ADJUSTABLE SENSITIVITY: Increase sensitivity dial to find small gas leaks. Decrease sensitivity to find larger explosive gas leaks while filtering out false alarms from background gas levels.