Air Quality Monitor, 3 in 1 CO2 Detector, E-ink Screen Air Quality Monitor in Door, Displays CO Temperature and Humidity, Air Quality Tester with Rechargeable Battery, Carbon Dioxide Detecor.Know your air : This air quality tester tracks main figures: Carbon dioxide (CO2), air temperature and humidity; display the real time figures on one screen.

Accurate CO2 detection : Based on NIDR+Photoacoustic technology, it has High precision CO2 measurement, and shows large range of CO2 concentration from 400ppm-5000ppm.

E-ink Screen : With a large 4.23 inch E-ink screen and 0°- 180° ultra large view angle, it helps you to avoide vision damage due to electronic screens.

Rechargeable Battery : The CO2 meter has a built-in 2500mAh rechargeable lithium battery lasting for 14 days and support type-C charging.

Emoji Indicators : Integrated with three-color LED indicators and emoji comfort to illustrate somatosensory comfort level at a glance.

Wide application : An Air Quality Monitor is suitable for bedrooms, baby rooms, hospital wards, hotels, classrooms and other places that require air quality detection.