Please note, this item ships from an international seller. Expected delivery is 10-15 days. 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 . CO2 detection : 400-5000PPM. detection : 0-50℃. Humidity detection : 0-99%RH. CO2 : 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 icon flashes in the charging state and it stops when it's full.   Any problems, feel free to . Honor to serve you!  Specifications: Name: CO2 meter  Color: whiteblack(optional)  Material: ABS 3in1 : CO2 concentrationtemperaturehumidity CO2 detection : 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 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 . CO2 detection : 400-5000PPM. detection : 0-50℃. Humidity detection : 0-99%RH. CO2 : The color ring will change according to the current CO2 concentration. USB charging: