MQ-2 MQ2 Gas Sensor Module For H2, LPG, CH4, CO, Smoke or Propane Detector Module

Operating Voltage is +5V.
Used to detect LPG, Alcohol, Propane, Hydrogen, CO, and methane.
Used as a Digital or analog sensor.
Sensitivity of Digital pin can be varied using the potentiometer.
Have a long life.
It has a Simple drive circuit.