This is the MQ2 GAS, LPG, Butane, Hydrogen sensor detector module for Arduino board, it is operates base on MQ2 detector, the sensitivity of the component is adjust by the trimmer resistor on-board, The 14CORE-MQ2 Module Sensor is sensitive to all LPG, Butane, Propane, Methane, Alcohol, Hydrogen, Smoke best uses for home, industrial automations .SpecificationPower Input: 5vResponse: High and SensitiveDetection: Wide detection scope for LPG, Butane, Propane, Methane, Alcohol, Hydrogen, Smoke, Gas