The MQ-3 Alcohol Sensor is a gas sensor specifically designed to detect alcohol vapors in the air. It operates on a 5V power supply and is widely used in breathalyzer devices, alcohol detection systems, and safety applications. The sensor works by measuring the concentration of alcohol vapors, providing an analog output that corresponds to the detected level. It is highly sensitive to ethanol and can detect alcohol levels in a range suitable for personal breathalyzer devices. With its reliable performance and ease of integration with microcontrollers like Arduino, the MQ-3 sensor is an essential component for various alcohol sensing and safety monitoring applications.