Features:Large LCD screen, different font colors display different air quality, green numbers, yellow numbers, orange numbers, red numbers,four colors above 2000ppm flash at the same time.The product has a compact structure and is easy to transport. The ventilation holes on the back not only accelerate the convection between the air and the machine,so as to obtain effective detection, but also provide good heat dissipation.The product does not need to be calibrated, it can be tested after booting, and the carbon dioxide can be accurately detected.It is used for agricultural production in greenhouse agriculture, production warehouses, laboratories, households, etc.It has a wide range of uses and strong practicability. It is used for epidemic prevention and control to detect the concentration of co2 in the population,so as to control the number of people and avoid the risk of cross-infection.Large-capacity 1200mah battery, long time work, C-type charging interface, convenient charging. Specification:Color: Black, White (Optional)CO2 Measuring range: 400-5000ppmTemperature measuring range: 0-50Humidity measurement range: 0%-99% urBattery: 5v, 1200mahItem size: 90*70*35mm / 3.5*2.8*1.4in. Packing list:1 * Carbon Dioxide Detector1 * USB data cable1 * User ManualNote:1. Please allow 1-3cm (0.4-1.18") difference due to manual measurement and slight color variation for different display setting.2. Due to the light and screen difference, the item's color may be slightly different from the pictures. Please understand.