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Product ID: 1176 The MQ-2 is a flammable gas and smoke sensor detects the concentrations of combustible gas in the air and outputs its reading as an analog voltage. The sensor can measure concentrations of flammable gas of 300 to 10,000ppm. The MQ-2 gas sensor is sensitive to LPG, i-butane, propane, methane, alcohol, Hydrogen and smoke. They are used in gas leakage detecting equipments in family and industry and in portable gas detector. Supply Voltage: 5V Sensitive to H2, LPG, CH4, CO, Alcohol, Smoke or Propane Analog and Digital Output Digital Out is high or low based on a adjustable preset threshold.