LCD screen displays air quality with different font colors: green for 400-799ppm, yellow for 800-1199ppm, orange for 1200-1599ppm, red for 1600-1999ppm, and all four colors flash when CO2 levels exceed 2000ppm. The compact and portable design makes it easy to carry. Ventilation holes on the rear enhance air convection for effective detection and provide efficient heat dissipation. The device requires no calibration, starts up quickly, and accurately detects carbon dioxide levels. Suitable for use in greenhouses, agricultural production, warehouses, laboratories, homes, and other environments. Equipped with a 1200mAh battery for extended operation and a Type-C charging interface for convenient charging. CO2 measurement range: 400-5000ppm. Temperature measurement range: 0-50°C. Humidity measurement range: 0-99% RH. Sensor type: semiconductor sensor. Battery: 3.7V, 1200mAh. Color: White. Material: ABS. Dimensions: 70 x 90 x 35 mm. Package includes: 1 x Air Quality Analyzer, 1 x USB Cable, 1 x English Manual. Only the items listed are included; other items are not part of the package. Note: Lighting and display differences may cause slight color variations between the image and the actual item. Measurement error allowance is +/- 1-3cm.