High quality double panel design, with power indicator and TTL output signal. | Using a simple circuit to convert the change in conductivity of the gas concentration corresponding to the output signal. | MQ-3 MQ3 Alcohol Sensor Module Breath Gas Detector Ethanol Detection | This sensor can detect a variety of flammable gas, is a low-cost sensors for a variety of applications. | The MQ-3 sensor can detect a variety of alcohol concentration in the atmosphere, is a low-cost sensor suitable for a variety of applications