Description: Adopts Advanced electrochemical detection module, with high accuracy, stable performance, can accurately detect TVOC, CO2 and HCHO value. Strong anti-interference ability, low consumption and long service life. Does not need calibration, it can be tested after booting, and it can accurately detect the air. Different colors corresponding to different air quality. Hundreds of ventilation holes at the back of housing not only accelerate the convection between the air and the machine, thereby realizing effective detection, but also provide a fine heat dissipation effect. Widely applications: agricultural planting, greenhouse vegetables, production warehouse, material processing, home interior, etc. Specification: Material: Plastic Charging Time: 2-3h Working Time: 6-7h Temp Measurement-Range: -10 to 5 degree Size Chart: 92 x 72 x 37 mm / 3.62 x 2.83 x 1.46 inch Package Includes: 1 Piece Air Quality Detector 1 Piece Manual 1 Piece USB Cable Note: 1. Please allow slightly error due to manual measurement. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3. Wish you a wonderful on-line shopping!