Features: 9 in 1: Multifunctional air quality detectors monitoring of CO2 concentration, COconcentration, TVOC value, HCHO value, PM2.5/PM10 value, temperature and relative humidity. Large digital screen with backlights, clear and easy to read, support alarm function. Using air semiconductor sensor, PM2.5 sensor and electrochemical sensor, high-performances chip, detection is more accurate, high accuracy, and the accuracy can reach 1PPM. Equipped with 2000mAh high-capacity rechargeable battery, low power consumption and long endurances, no need to replace the battery frequently. Suitable for office, school, warehouse, agricultural plantings, etc. No need to calibrate at starting, automatic monitoring. Specifications: Material:ABS Color:Black,White Display: 2.8Inch Screen Size:Approx.89mm/3.5''x82mm/3.2x36mm/1.4'' Note: Please allow 1mm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x Air Quality Monitors