Carbon dioxide detector real-time monitoring: real-time detection of indoor environmental quality, measured by three key indicators - carbon dioxide, temperature and humidity, comprehensive indoor air quality, to breathing health The high-definition LED screen enables you to read data faster and more easily. There are 4 different color bars on the screen indicating CO2 concentration levels: green for healthy, yellow for attention, orange for ventilation and red for danger. This allows for a quick identification of the surrounding air quality. Before use, put the CO2 sensor in the vent for 5-10 minutes for data calibration, if the air quality changes, please wait 35 seconds for the detector to sense the change With a simple and generous design, its mini size makes it easy to carry out, and a built-in 1000 mAh rechargeable battery can continuously work for 8 hours, allowing you to check the air quality anytime and anywhere. This portable CO2 monitor supports USB charging and has a low battery indicator. Using NDIR non-scattering infrared sensor, CO2 detector has stable performance and high precision This mini carbon dioxide monitor is used for grow room, travel, camping, RVs, cars, hotels, parties, wine cellars, kitchens, bedrooms, offices, schools, agricultural planting, indoor , etc.