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The MQ4 Gas Sensor is a methane detection module widely used in gas leak monitoring systems. It is capable of detecting methane (CH4) and natural gas in industrial and home safety applications. The sensor operates by measuring the resistance change when exposed to gas. It has high sensitivity, making it ideal for real-time leak detection in kitchens, gas plants, and confined spaces. The MQ4 sensor provides an analog output that varies based on gas concentration. It is commonly used in smart home security systems and IoT-based air quality monitoring. The sensor has a preheating period for optimal accuracy and requires proper ventilation for stable readings.