3-in-1: Co2 Detector can monitor the carbon dioxide concentration (400-5000PMM), temperature (0-50C), and humidity (0%-99%RH) around you in real-time, refreshing every 2s, the data is more accurate, and Built-in high-performance chip, faster detection LCD Display + Smart Backlight: Large LCD screen & smart backlight helps you to read more easily, CO2 concentration, Hcho, and Tvoc at a glance, even at a long distance And its small size makes it convenient for you to carry it anywhere. USB charging battery: Built-in 1200mAh high-capacity battery, can work for 6h, only supports 5V adapter or computer USB charging. More functions: intelligent early warning system, gas recognition algorithm, multiple interference prevention, air convection technology, greenhouse compensation calibration, suitable for agricultural planting, production warehouse, raw material processing, home, school, office, and other occasions. Note: Due to the unstable atmospheric environment, the sensor of this product is sensitive to the environment, and the data may fluctuate slightly