Description Sensitive for carbon monoxide 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-7 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 Carbon monoxide monitor