The MQ2 Gas Sensor from Seeed Studio is a gas sensing module that can be used to detect a variety of combustible gases, including methane, ethane, hexane, propane, and alcohol. The module can measure concentrations from 50 to 10,000ppm, and is suitable for various applications such as smart homes, fire detection systems, gas leakage detection, air pollution monitoring, and more. The MQ2 Gas Sensor is made of a high-selective gas sensitive material and has an analog output that can be tracked and adjusted by an on-board potentiometer. It also includes a LED indicator that can be used to monitor the working status. Additionally, the MQ2 Gas Sensor is equipped with an on-board heater and temperature compensation system to improve the accuracy of the readings.