5 in1 Air Quality Monitor Multifunctional Automatic Display Indoor Office Wall Hanging Screen Display Air Detector Purifier

 1. TVOC concentraiton data display

 2. HCHO concentration data display

 3. CO2 concentration data display (semiconductor)

 4. Humidity display fuction

 5. Alarm function

 6. Air quality grade display

 7. Low battery warning

 8. Desktop/wall use

 9. Temperature display fuction (Celsius and Fahrenheit can be freely switched