Features:There are five types, single gas alarm detection/ solenoid valve/single pipe shutoff valve/alarm detection+solenoid valve/ alarm detection+ pipe shutoff valve, selecting according to your needs.Work as standalone : detect the gas leakage ,the detector will sound alarm and the indicator light will flash .Work with solenoid valve : detect the gas leakage ,the solenoid valve will shut off automatically .Work with pipe cutoff valve: detect the gas leakage, the pipe will cutoff automatically.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.Suitable for household & commerical use.Package Includes:1x Gas Alarm DetectionSpecifications:Material: ABS+ AluminumSize 1: 105x90x55mm/ 4.13x3.54x2.16 inSize 2: 90x65mm/ 3.54x2.55 inSize 3: 105x73mm/ 4.13x2.87 in