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 surface of the screen, you can also use it as a mini vanity mirror. High Precision Measurement -- The detector adopts non-dispersive infrared technology with vents The rear vent and a built-in NDIR infrared sensor, which can accurately detect the concentration of CO2 gas, ranging from 400 to 5000 PPM. The accuracy can reach 1 PPM. Triple color indication -- Built-in 3 color indicator lights. Red, yellow and green colors represent poor, normal and good air quality conditions, respectively. You can intuitively understand the quality of the air you breathe. Your best monitoring assistant health. Portable and Energy Saving -- Lightweight than 150g and easy to carry.A built-in rechargeable battery is inside.It could also be charged from the USB cable.Fully charged before using in just 2 to 3 hours.