Feature: MQ-2 MQ2 Smoke Gas LPG Butane Hydrogen Gas Sensor Detector Module For Arduino 100% band new and high quality Specification: Quantity:1pc Color : black Size:32mmx22mmx27mm/1.26''x0.86''x1.06'' Main Chip: The LM393 ZYMQ - 2 Gas Sensor Working Voltage: DC 5 V Great for home or factory gas leakage detection Use for Detecting: Combustible gas such as LPG butane methane alcohol propane hydrogen smoke etc Package Included: 1 x MQ-2 Smoke Gas LPG Butane Hydrogen Gas Sensor Detector Module For Arduino