Large-screen LCD, different font colors show different air qualityGreen 400-799ppmYellow 800-1199ppmOrange 1200-1599ppmRed 1600-1999ppmFour colors above 2000ppm flash at the same timeThe product is small in size and easy to carry. The ventilation holes on the back not only accelerate the convection between the air and the machine, so as to achieve effective detection, but also provide a good heat dissipation effect. This product does not require calibration, can be tested at startup, accurate detection of carbon dioxide, used in greenhouse agricultural production, production warehouses, laboratories, homes, etc. Large-scale and practical, used for epidemic preventionand control, detecting CO2 concentration in the crowd, controlling the number of people, and avoiding the risk of cross-infection1200mAh large-capacity battery, long working time, Type-C charging interface, easy to chargeColour: BlackCO2 measurement range: 400-6000ppmTemperature measurement range: 0-50Humidity measurement range: 0-99RHBattery: 3. 7V, 1200mAhProduct size: 90*70*35mm/3. 5*2. 8* 1. 4 inchesItem Weight: 117 g / 4. 1 ozPackage size: 140 * 125 * 41 mm / 5. 5 * 4. 9 * 1. 6 inchesPackage Weight: 173 g / 6. 1 ozPackage: 1*Air Quality Analyzer 1*USB Data Cable 1*User Manual In order to control the number of people and avoid the risk of cross infection.