Features: Large LCD screen with different font colors indicating varying air quality levels: Green (400-799 ppm), Yellow (800-1199 ppm), Orange (1200-1599 ppm), Red (1600-1999 ppm), and a flashing four-color display above 2000 ppm. Compact and portable design. Ventilation holes on the back accelerate air convection for efficient detection and provide excellent heat dissipation. No calibration required! Simply turn it on and start testing. Accurately detects carbon dioxide levels in greenhouses, agricultural production, warehouses, laboratories, homes, etc. Versatile and practical for epidemic prevention and control. Detects CO2 concentration in populated areas to help manage occupancy and reduce the risk of cross-infection. Equipped with a 1200 mAh high-capacity battery for extended use. Features a Type-C charging interface for easy charging. Specifications: Color: White CO2 Measuring Range: 400-5000 ppm Temperature Measuring Range: 0-50℃ Humidity Measuring Range: 0-99RH Battery: 3.7V, 1200 mAh Item Size: 90 * 70 * 35 mm Item Weight: 117 g Package Size: 140 * 125 * 41 mm Package Weight: 173 g Package List: 1 * Air Quality Analyzer 1 * USB Cable 1 * User Manual