Main Parts : 
Power Jack x 2
Gas Sensor x 1
Resistor Trimmer x 1
2-pin Stackable Header x 1
Sensing Resistance : 10K~60K(5000ppm methane)
Trimmer Resistance : 100KΩ
Output : 10%~90% Vcc
Brick Unit : 5 x 5

Note : Use resistor trimmer to adjust output voltage