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Mq-2 Gas Sensor Module Smoke Methane Butane Detection (Blue) for Arduino DC 5V 150mA Signal Analog Ttl Output Module, Find Details and Price about Sensor Module Gas Sensor Module from Mq-2 Gas Sensor Module Smoke Methane Butane Detection (Blue) for Arduino DC 5V 150mA Signal Analog Ttl Output Module - Shenzhen Ke Zhi You Technology Co., Ltd.