【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 practical tool for your bedroom and office. With the special coating on the screen surface, you can also use it as a mini vanity mirror. 【High Precision Measurement】-- The detector adopts non-dispersive infrared technology with air vents on the back and a built-in NDIR infrared sensor, which can accurately detect the CO2 gas concentration, 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 represent poor, normal, and good air quality conditions respectively. You can intuitively understand the quality of the air you breathe. Your best health monitoring