2.9-inch Air Quality Monitor CO2 Meter USB Rechargeable Thermometer & Hygrometer TVOC/HCHO/CO2 Detector CO2 Concentration Detector for Home Office

Features:
Real-time temperature, humidity, CO2 concentration, HCHO, TVOC can be measured at the same time.
1s automatically refresh the detection data, monitor in real time.
2.9-inch color LCD display, large enough to view the data.
Intelligent alarm sounds up once the data exceed the value.
USB rechargeable air quality detector built-in with 1200mAh lithium battery.
Can be used in home, greenhouse, breeding, school and other public places to monitor carbon dioxide and temperature/humidity.