Features: brand new and high quality Ens160 is a multi-gas sensor specially designed for indoor air quality monitoring. It can best detect a variety of gases and volatile organic compounds (VOC-), including ethanol, NO2.. The air quality sensor is used for home and building automation, consumer goods, electrical appliances and air purificationDetection of reducing (VOC-) and oxidizing gases (such as NO2) MOX- supports up to 4 independent gas sensors Integrated sensor measurement and heaters drives control.Integrated calibrated sensor and automatic baselines correction algorithm Specifications: Material:PCB Size:Approx.24x19.2mm/0.94x0.75inches Package Includes: 1x Humidity Sensor note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.