The MQ7 is a simple-to-use Carbon Monoxide (CO) sensor suitable for sensing CO concentrations in the air. It can detect CO-gas concentrations anywhere from 20 to 2000ppm.
SPECIFICATIONPower supply needs: 5V
Interface type: Analog
Pin Definition: 1-Output 2-GND 3-VCC
High sensitivity to carbon monoxide
Stable and long life
This product and description is from DFRobot.