A. Three-in-one function: It can be used as a carbon dioxide concentration detector, a thermometer, and a hygrometer simultaneously. B. Battery-powered: It is equipped with a built-in 1200mAh lithium battery and is charged using a Type-C charging cable. C. Color screen: It displays the current carbon dioxide data, temperature, and humidity. The color ring changes according to the carbon dioxide content. D. Easy to operate: Long-press the "On/Off" button for 3 seconds. The product does not need calibration and can start detection once powered on. E. Portable: It can be placed in the kitchen, living room, or bedroom, and can also be carried outdoors. It has a wide range of practical uses and can be used for epidemic prevention and control. By detecting the carbon dioxide concentration in a crowd, the number of people can be controlled to avoid the risk of infection. F. Dimensions: 90 x 70 x 35 mm G. Material: ABS H. Color: Black I. Package contents: - 1 air quality analyzer - 1 USB cable - 1 instruction manual Only the above items are included in the package, and no other products are provided. Note: Light and different displays may cause slight differences between the color of the item and the actual product. The allowable measurement error is ±1 - 3 cm.