Features: Available in five configurations: single gas alarm detection, solenoid valve, single pipe shutoff valve, alarm detection with solenoid valve, or alarm detection with pipe shutoff valveselect based on your requirements. Standalone operation: detects gas leakage and triggers audible alarm and flashing indicator light. Compatible with solenoid valve: automatically shuts off gas supply upon detection of leakage. Compatible with pipe shutoff valve: automatically cuts off the gas line when leakage is detected. Detects combustible and flammable gases including methane, natural gas, propane, ethane, butane, alcohol, coal gas, gasoline, toluene, kerosene, sewer gas, and other flammable vapors. Suitable for residential and commercial applications. Package Includes: 1 x Gas Alarm Detector Specifications: Material: ABS + Aluminum Size 1: 105 x 90 x 55 mm (4.13 x 3.54 x 2.16 in) Size 2: 90 x 65 mm (3.54 x 2.55 in) Size 3: 105 x 73 mm (4.13 x 2.87 in) Note: Please allow 1-3 cm error due to manual measurement. Due to differences in monitor displays, the actual product color may vary from the images shown.