Air Quality Sensor Features: High Sensitivity High sensitivity to Ammonia, Sulfide and Benze Stable and Long Life Detection Range: 10 - 300 ppm NH3, 10 - 1000 ppm Heater Voltage: 5.0V Dimensions: 18mm Diameter, 17mm High excluding Long life and low cost Applications: Domestic air pollution detector Industrial air pollution detector Portable air pollution detector