1. Product Features 1. It is equipped with a large LCD screen that displays different air quality levels in different font colors. Green indicates 400 - 799 ppm; yellow indicates 800 - 1199 ppm; orange indicates 1200 - 1599 ppm; red indicates 1600 - 1999 ppm. When it is above 2000 ppm, the four colors flash simultaneously. 2. The product is relatively compact and easy to carry. 3. The ventilation holes on the back can accelerate the convection between the air and the device for effective detection and also have a heat - dissipation effect. 4. The product does not need calibration and can start detecting once powered on. It can detect the carbon dioxide content relatively accurately and can be used in places like greenhouse cultivation, agricultural production, production warehouses, laboratories, and households. 5. It has a wide range of uses. It can be used for epidemic prevention and control to detect the carbon dioxide concentration in a crowd, so as to control the number of people and reduce the risk of cross - infection. 6. It is equipped with a 1200 mAh battery, allowing for a relatively long working time. It uses a Type - C charging interface for convenient charging. 2. Product Specifications 1. Color: White 2. Carbon dioxide measurement range: 400 - 5000 ppm 3. Temperature measurement range: 0 - 50°C 4. Humidity measurement range: 0 - 99%RH 5. Battery: 3.7V, 1200 mAh 6. Product dimensions: 90 * 70 * 35 mm (3.5 * 2.8 * 1.4 inches) 7. Product weight: 117 g (4.1 ounces) 8. Packaging dimensions: 140 * 125 * 41 mm (5.5 * 4.9 * 1.6 inches) 9. Packaging weight: 173 g (6.1 ounces) 3. Packaging List 1. One air quality analyzer 2. One USB data cable 3. One user manual