Home Safety Guard-- The air quality monitor can monitor carbon dioxide in real time. Our detector with multiple functions can also detect indoor temperature and relative humidity at the same time. The best choice for your comfortable living and office environment. Exquisite Design-- Exquisite size 70*80*35mm.A perfect decoration and a practical tool for your bedroom and office.With the coating special on the screen surface, you can also use it as a mini vanity mirror. High Accuracy Measurement-- The detector adopts non-dispersive infrared technology with air vents. vent on the back and a built-in NDIR infrared sensor, which can accurately detect CO2 gas concentration, ranging from 400 to 5000 PPM. Accuracy can reach 1 PPM. Triple color indication --Built-in 3 color indicator lights. Red, yellow and green colors represent conditions respectively. bad,normal and good air quality ions.You can intuitively understand the quality of the air you breathe.Your best health monitoring assistant. Portable and energy saving -- Light as 150g and easy to carry.A built-in rechargeable battery is inside.It also could be charged from the USB charging cable.Fully charged before using in just 2-3 hours.