SPECIFICATION Power supply: 5V Interface type: Analog Pin Definition: 1-Output 2-GND 3-VCC High sensitivity to CH4οΌNatural gas Small sensitivity to alcohol, smoke Fast response Stable and long life Simple drive circuit Size: 40x20mm(1.57"x0.79")
SHIPPING LIST Arduino CH4 Gas sensor (MQ4) x1 Gravity Analog Cable x1
Wiki : https://wiki.dfrobot.com/Analog_Gas_Sensor_MQ4___SKU_SEN0129_