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MQ-4 DC5V Smoke Methane Propane Hydrogen Gas Sensor Detector Module for Arduino.Dual-way Signal Output, Analog output and TTL level outputHigh sensitivity to LPG, gas, alcohol, hydrogen and moreFast response and recoveryGood steadiness and long service lifeGreat for home or factory gas leakage detectionUse for Detecting: Combustible gas such as LPG, butane, methane, alcohol, propane, hydrogen, smoke, etc.Specification:Main chip:MQ-4 gas sensor moduleWorking Voltage: 5V DCDetecting Range: 300 to 10000ppmTTL output valid signal is lowSize: 32X22X27mm