Capable of detecting Natural Gas (methane, CH4) and LPG (propane and butane) in air in homes, office or other indoor spaces. Needs to be installed 30 cm under ceiling and 1.5-4 meters away from gas supply for detecting natural gas leakage or 30 cm above floor and 1.5-4 meters away from gas supply for detecting LPG gas. It comes with 4-types of alarms with different color codes. On detecting leakage, sound alarm goes on with red alarm light coming on and the valve is driven to turn-off gas supply.