Features: Multifunctional air quality detector, real-time monitoring of carbon dioxide concentration, temperature and relative humidity of air. The color ring on the screen will change according to the CO2 concentration, you can easily know the CO2 level over time. Thanks to the use of a semiconductor air TVOC sensor and a high-performance system, detection is more accurate, more accurate, and accuracy can reach 1PPM. Equipped with high capacity 1500mAh battery (replaceable with higher capacity batteries of the same model), environmental protection, long battery life, no need to replace batteries frequently. With multiple ventilation holes that accelerate convection between air and detector to achieve effective detection and ensure good heat dissipation effect. Lightweight and portable, suitable do home, office, school, warehouse, planting in agriculture, etc. No need for calibration at startup, automatic monitoring. Technical data: Colour black Material: ABS PC CO2 detection range: 400-5000PPM, 505%PPM CO2 Detection Sensitivity: 1PPM TVOC detection range: 0-2,0 mg/m³ Temp. Measuring range:-10-50 Temp. Measurement accuracy: 1 Humidity measurement range: 0-99% RH Humidity measurement accuracy: 2% RH Charging Mode: 5V, 500mA Battery: 1*18650 battery, 3,7 V/1500 mAh; Product Size: 89 * 70 * 35 cm / 3,5 * 2,8 * 1,4 inch Product Weight: 146g/5,1oz (incl. battery) Package Weight: 208g/7.3oz List of things do packing: 1 * CO2 detector 1 * USB cable 1 * User Manual