Features: LCD large screen with color-coded air quality display: green (400-799 ppm), yellow (800-1199 ppm), orange (1200-1599 ppm), red (1600-1999 ppm). All four colors flash when CO2 levels exceed 2000 ppm. Compact and portable design. Ventilation holes on the back enhance air convection for faster and more accurate detection while providing effective heat dissipation. No calibration required. Ready to use upon startup. Accurately detects carbon dioxide levels. Suitable for use in greenhouses, farms, warehouses, laboratories, homes, and similar environments. Ideal for monitoring indoor air quality to support ventilation management in occupied spaces. Equipped with a 1200 mAh rechargeable battery for extended operation. Features a Type-C charging port for convenient charging. Specifications: Color: White CO2 Measurement Range: 4005000 ppm Temperature Measurement Range: 050C Humidity Measurement Range: 099% RH Battery: 3.7V, 1200 mAh Item Size: 90 70 35 mm / 3.5 2.8 1.4 in Item Weight: 117g / 4.1 oz Package Size: 140 125 41 mm / 5.5 4.9 1.6 in Package Weight: 173g / 6.1 oz Packing List: 1 Air Quality Analyzer 1 USB Cable 1 User Manual