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: The large LCD display and the smart backlight help you read more easily, CO2, Hcho and Tvoc concentration 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 charging computer USB. Other functions: intelligent early warning system, gas recognition algorithm, multiple interference prevention, air convection technology, greenhouse compensation calibration, suitable for agricultural plantations, production warehouse, commodity 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 vary slightly!