characteristic:Large LCD screen, different font colors display different air quality, green numbers, yellow numbers, orange numbers, red numbers, and four colors above 2000ppm flash at the same time.The product is compact and easy to transport. The ventilation hole at the rear can not only accelerate the convection between the air and the machine to obtain effective detection, but also provide good heat dissipation effect.The product does not need calibration. It can be tested when it is turned on, and carbon dioxide can be accurately detected. It is used for greenhouse agriculture, production warehouse, laboratory, household and other agricultural production.It is widely used and practical. 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 working time, type c charging interface, convenient charging.Specifications:Color: whiteMeasuring range: 400-5000ppm Temperature measuring range: 0-50 Humidity measurement range: 0% - 99% urBattery: 3.7v, 1200mahItem size: 90 * 70 * 35mm/3.5 * 2.8 * 1.4inProduct weight: 129gPacking list:1 * Carbon dioxide detector1 * USB data cable1 * English user manual