Features: The silicon gas detection chip structure comprises a sensitive microed mechanical diaphragm, upper sensing layer, and embeddedly heating resistor. MICS 4514 detection Module integrates three independently gas detection In harsh environments, it can detect automotive exhaust alongside industrial and agricultural emissions. Small Size with double mounting holes Delivering precise automotive exhaust and industrial/agricultural emission monitoring in harsh environments Specifications: Module supply voltages: DC4.9V–5.1V Operating temperature and humidity: -30°C to 85°C with two mounting holes Detectable gas ranges Ethanol C2H5OH 10-500ppm Hydrogens H1 1-1000ppm Ammonia NH3 1-500ppm Methane CH4 more than 1000ppm C3H8 more than 1000ppm Isobutane C4H10 more than 1000ppm Package Includes: 1PC MICS-4514 gas Detection module CO/NO2/NH3/CH4 Concentration detection note: There might be a bit color distortions due to different computer resolution There might be size errors due to different computer resolution