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. Package Includes: 1x Air Quality-Detector 1x Instructions 1x Data Cable note: ①.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. ②.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understandings.