The use of computers also need other accessories to complete the computer to run a whole set of processes, the keyboard, the mouse is the main accessories of the computer interaction, allowing users to control a variety of computer operations.

Mouse is divided into wired mouse and wireless mouse; keyboard is divided into wired keyboard and wireless keyboard, wireless keyboard needs to use the keyboard cable, the computer and the keyboard connected successfully; from the mobile phone to transfer files to the computer, tablet PC need to use USB cable, from the computer to transfer files to the mobile phone, to the wireless mouse charging also need to use USB cable.

Various devices co-operate with each other and work together, and can accomplish various tasks.