1、Color screen display: The color screen display makes it easier for you to read and identify in darkness. 2、Wide application: The portable size enables you to take it anywhere you go. It can be used at home, office, shopping mall, hotels and etc. 3、3 in 1: It can detect real-time CO2 concentration, humidity, and temperature. CO2 detection range: 400-5000PPM.Temperature detection range: 0-50℃. Humidity detection range: 0-99%RH. 4、CO2 detector: The color ring will change according to the current CO2 concentration. 5、USB charging: It can be charged through the charging port of any mobile device. The battery icon flashes in the charging state and it stops when it\u0027s full. Features: Color screen display: The color screen display makes it easier for you to read and identify in darkness. Wide application: The portable size enables you to take it anywhere you go. It can be used at home, office, shopping mall, hotels and etc. 3 in 1: It can detect real-time CO2 concentration, humidity, and temperature. CO2 detection range: 400-5000PPM.Temperature detection range: 0-50℃. Humidity detection range: 0-99%RH. CO2 detector: The color ring will change according to the current CO2 concentration. USB charging: It can be charged through the charging port of any mobile device. The battery flashes in the charging state and it stops when it's full. Any problems, feel free to contact us. Honor to serve you! Specifications: Name: CO2 meter Color: white/black(optional) Material: ABS 3in1 detector: CO2 concentration/temperature/humidity CO2 detection range: 400-5000ppm CO2 accuracy: ±1ppm Humidity accuracy: ±2%RH Size: 90*70*40mm Battery: 3.7V 1200mAh Charging time: 2-3h Work time: 4-6h Package information: Size: 141*98*48mm Weight: 175g Package list: 1*CO2 meter 1*charging cable 1*instruction 1*CO2 meter 1*charging cable 1*instruction