... best price fast delivery! New&original MQ-2 smoke sensor/gas sensor Features:1. A wide range ... for liquefied gas, butane, propane, methane, alcohol, hydrogen, smoke and detection.specificationsa. standard working conditionsB. Environmental conditionsC. Responsed. ... Bakelite (Black Bakelite) Detection Gas : Combustible gas and smoke Concentration : 300-10000ppm(Combustible gas) Circuit:1.Loop Voltage ...