External computer devices and their purpose

Power bank


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Computer peripherals, also called peripherals, are items that are connected to the computer externally to control input or output functions. These computer devices are designed to provide instructions to the software (input) or to provide the results of its execution (output).

The main external devices of the computer are keyboard, mouse, microphone, monitor, memory card, webcam, sound speakers, etc.

Other important external computer components are USB ports, printers, scanners, portable chargers, etc.

What are the most important computer peripherals?

As we mentioned, some of the most important and commonly used external computer devices are the monitor, computer mouse, web camera and sound speakers. Let’s take a closer look at each of the external devices and examine their purpose.



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A computer monitor is an electronic device used to display video output from a computer. Display monitors are used in many computing devices, from laptops to small mobile devices such as cell phones and MP3 players.

The monitor consists of the following components:

  • Display module – thin film transistor liquid crystal display (TFT-LCD) technology is often used
  • Chain
  • Body

Monitor performance is measured by the following key factors:

  • Brightness: brightness in candelas per square meter (cd/m2 or nits)
  • Display resolution: The number of pixels per square inch
  • Refresh rate: display frequency changes
  • Reaction time: the time it takes for a pixel to become active (active), inactive (inactive), and vice versa. Measured in milliseconds.
  • Contrast ratio: the luminance ratio between the lightest (white) and darkest (black) colors that the monitor can produce
  • Energy consumption: measured in watts



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Keyboard is one of the main peripherals of a computer. A keyboard, similar to a typewriter, consists of buttons used to create letters, numbers, and symbols, and to perform additional functions. These external computer devices are connected to the computer system via a wired or wireless connection.

Most keyboards have a very similar layout. The most widely used layout in English is called QWERTY, named after the sequence of the first six letters from the top left.

Because this keyboard layout remained unchanged over the years, it allowed users to easily switch between computer systems and use their typing skills on multiple devices.

Computer mouse

computer mouse

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computer mouse is a hand-held input device that controls the cursor and can move and select text, icons, documents, and folders.

Below we will list all the features of the computer mouse that help users to use the computer:

  • Move the cursor on the screen – the main function of a computer mouse.
  • Open or launch the application – moving the cursor to an icon, folder, clicking on an object opens a document or launches a program.
  • Choose – the mouse also allows you to select text or documents and highlight and select multiple documents at once.
  • Drag – once you select something, it can also be moved using the drag method.
  • Place the mouse cursor – Hovering over objects with additional information makes it easier to find the function of each object on the screen.
  • Scroll – may be needed when working with long documents or browsing long web pages.
  • Perform other functions – many computer mice have additional buttons that can be programmed to perform any function.



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A webcam is a small camera connected to a computer. Such cameras are used for various purposes: from taking photos to live video calls during conferences. Most laptops have a webcam built into the computer screen, but external webcams are also sold.

Note that when purchasing an external webcam, you may also need to purchase a microphone if you intend to use the camera for video or live video recording.

Computer speakers

computer speakers

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Speakers for computers are an output device that connects to a computer to generate sound. The signal used to produce sound from the computer speaker is created by the computer’s sound card.

The essential purpose of computer speakers is to emit sound. All computers make sound, but their sound quality varies.

Other computer peripherals

There are other computer peripherals in the market that are no less important and necessary. These are printers, scanners, portable chargers (Power Bank) and USB connectors. Let’s briefly review the most important of them.



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Probably many of us cannot imagine working in the office or at home without it printers. A printer is a device that accepts text and graphic output from a computer and transfers the information to paper, usually standard-size, 8.5″ x 11″ sheets of paper. Printers vary in size, speed, complexity, and cost.



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A scanner is an electronic device that can capture images of physical objects and convert them into digital formats that can be stored on a computer and viewed or modified using software.

Various types are available scanners with different resolutions. In the world of electronic data transmission, scanning is considered the most economical and reliable method of image transmission.

Portable Chargers (Power Bank)

Power bank

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The purpose of a power bank is to charge electronic devices powered by batteries. Portable chargers can be small enough to fit in your pocket or larger and more capacious. „Power Bank“ used to charge mobile phones, tablets, speakers and even laptops!

Before you buy a portable charger, decide what capacity charger you need. Power bank chargers are measured in mAh. It is a unit of measurement for electricity, especially batteries. A battery with a higher mAh capacity will have more energy and last longer.

The mAh unit of measurement for rechargeable batteries in power packs indicates how much charge the battery can hold and how long it can power another electronic device.

Although internal computer devices are very important, many of us cannot do without external computer devices such as printer, scanner, speakers, monitor, keyboard, computer mouse, portable charger or USB connector. If you think you’re missing some peripherals for your computer, you’ll find a wide selection in our online store.


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