Description Sensitive for benzene, alcohol, smoke Output voltage boosts along with the concentration of the measured gases increases Fast response and recovery Adjustable sensitivity Signal output indicator View more What's Included MQ-135 Gas Sensor × 1 4-pin custom connector jumper wire × 1 Links PDF Files Specifications Power: 2.5V ~ 5.0V Dimension: 40.0mm * 21.0mm Mounting holes size: 2.0mm Applications Air quality monitor