Hama CO2 monitor for monitoring air quality (CO2 traffic light, air quality monitor for home, office, and on the go, air quality monitor with display of CO2, HCHO, TVOC, and Air Quality Index AQI)

"Air quality monitor: Detects concentration of carbon dioxide (CO2), formaldehyde (HCHO), and volatile organic compounds (TVOC) in the air" "Air quality sensor with AQI: Regularly ventilating can reduce aerosol concentration, high CO2 and AQI values can be indicators" "Versatile use indoors and outdoors: CO2 traffic light for home, office, or crowded rooms, e.g. in the classroom at school" "Rechargeable battery: Detector can operate up to 4 hours without power supply, requires an external USB power adapter for charging (not included)" "Package contents: 1x Hama air quality monitor with display of CO2, HCHO, and TVOC, 1x Micro-USB cable, 1x German user manual"