2, the mouse: the mouse is also a commonly used computer input devices, it can be positioned on the computer screen cursor, and through the keys and scroll wheel device on the cursor passed through the location of the screen elements to operate. There are also many types of mice, such as: two-button mouse, three-button mouse, scroll wheel mouse.
3, microphone: microphone can convert sound signals into electrical signals, the principle is that the vibration of the sound to the microphone's diaphragm, to promote the inside of the magnet to form the current, and will be sent to the back of the sound processing circuit for amplification.
4, monitor: the monitor is the most common output device of our computer. The monitor is a computer-generated characters, numbers, graphics and images and other data through a specific transmission device to display the screen and then reflected to the human eye display tool. According to the principle of display can be divided into different CRT display, LCD display, LED display and so on.
5, printer: printer is the most common output device in our office, it is used to our computer data in the form of text or graphics permanent output to paper, transparencies, textiles and other external media. Some of the printers we commonly use are needle printers, inkjet printers, laser printers, etc. Now the rise of 3D printing technology, which has changed the traditional way of printing applications, gradually applied to construction, machinery manufacturing, medical and other fields.