Feature: 1. Multifunctional air quality detector, real-time monitoring of carbon dioxide concentration, temperature and relative humidity in the air. 2. LCD screen with large digital display, clear and easy to read. Intelligent backlight, soft and eye conservation. 3. The colorful ring on the screen will change according to CO2 concentration, you can easily know the CO2 level in time. 4. Using air semiconductor TVOC sensor, plus high-performance chip, detection is more accurate, higher precision, and the accuracy can reach 1PPM. 5. Equipped with 1200mAh high-capacity rechargeable battery(Repalceable with larger capacity batteries of the same model), environmental conservation, long battery life, no need to replace the battery frequently. 6. With multiple ventilation holes, which accelerate the convection beyween the air and the detector, to achieve effective detection and provide a good heat dissipation effect. 7. Lightweight and portable, it is suitable for home, office, school, warehouse, agricultural planting, etc. No need to calibrate at startup, automatic monitoring. Specification: Specifications: Color: Black Material: ABS + PC CO2 Detection Range: 400-5000PPM, ±50±5%PPM CO2 Detection Sensitivity: 1PPM TVOC Detection Range: 0-2.0mg/m³ Temp. Measurement Range: -10-50℃ Temp. Measurement Accuracy: ±1℃ Humidity Measurement Range: 0-99%RH Humidity Measurement Accuracy: ±2%RH Charging Mode: 5V, 1A Battery: 1 * lithium battery Battery, 3.7V/1200mAh Item Size: 89 * 70 * 35cm/ 3.5 * 2.8 * 1.4in Item Weight: 146g/ 5.1oz(Battery Included) Package Size: 145 * 125 * 45cm/ 5.7 * 4.9 * 1.8in Package Weight: 200g/ 7.1ozzge . Package List: 1 * CO2 Detector 1 * USB Cable 1 * User's Manual