3-in-1: CO2 detector can monitor carbon dioxide concentration (400-5000PMM), temperature (0-50C) and humidity (0%-99% RH) around you in real time, updating every 2s, the data is more accurate and better built-in chip, faster detection! LCD display and intelligent backlight: Large LCD display and intelligent backlight help you to read more easily, the concentration of CO2, Hcho and Tvoc at a glance, even at long distance! And its small size makes it convenient to take anywhere. USB Charging Battery: Built-in 1200mAh high capacity battery, can work for 14 hours, only support 5V adapter or USB charging computer. Other functions: intelligent early warning system, gas recognition algorithm, multiple interference prevention, air convection technology, greenhouse compensation calibration, suitable for agricultural planting, production warehouse, processing goods, 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 vary slightly!