Features: WiFi-function: with intelligent WiFi-function, real-time detection wherever. USB power supply: safe and reliable, provide long-term monitoring with-non stop. Cloud- computing: internet of Things creates powerful cloud- computing capabilities for the air testing. Auto calibration, Exceeding Alarming with auto detection and measuring. It can detect HCHO/ TVOC/ CO2/PM2.5. Specifications: Material:ABS Size:Approx.9x3.5x7cm/3.54x1.37x2.75inch Color:Black/White Built-in lithium-battery 2000mAh Charging for more than 3-hours can last for 240-360 minutes. Note: .Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. .Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understandings. Package includes: 1x Air Quality-Detector 1x Instructions 1x Data Cable