MQ-9 memiliki sensitivitas yang tinggi terhadap gas dengan kandungan Carbon Monoxide, Methane and LPG. Size: 32mm X22mm X24mm length * width * height Second, the main chips: the LM393, the MQ-9 gas sensor Third, the working voltage: DC 3-5V Character * Good sensitivity to CO/Combustible gas * High sensitivity to Methane, Propane and CO * Long life and low cost * Simple drive circuit Application * Domestic gas leakage detector * Industrial gas detector * Portable gas detector