USB, the abbreviation of universal serial bus in English, is not only a serial bus standard, but also a technical specification of input and output interface. It is widely used in information communication products such as personal computers and mobile devices, and extended to photography equipment, digital TV (set-top box), game console and other related fields. The latest generation is USB4, with transmission speed of 40Gbit / s, three-stage voltage of 5V / 12V / 20V, maximum power supply of 100W, and the new type C interface allows positive and negative blind insertion.
With the popularity of various digital devices, especially MP3 and digital cameras, there are more and more USB devices around us. However, although these devices adopt USB interface, the data cables of these devices are not exactly the same. These data lines are the same at one end of the PC, but when connecting the device end, various interfaces are usually adopted for volume consideration.