The silicon gas sensor chip structure consists of a sensitive micromechanical diaphragm, an upper sensing layer and an embedded heating resistor. Three gas detection components are integrated. In harsh environment, automobile exhaust can detect industrial and agricultural exhaust. Module power supply voltage: DC4.9V-5.1V Operating environment temperature and humidity:-30C-85C 5-95% RH Detectable gas range Carbon monoxide CO 1-1000ppm Nitrogen Dioxide NO2 0.05-10ppm Ethanol C2H5OH 10-500ppm Hydrogen H1 1-1000ppm Ammonia nh3-500ppm Methane CH4 1000ppm Propane C3H8 1000ppm Isobutane C4H10 1000ppm Color: As Shown Material: ABS Package Contents: 1 * Module 1 * Pin header Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.