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A computer keyboard is an input device that allows a person to enter letters, numbers, and other symbols into a computer. When one of these are pushed, an electrical circuit is closed, and the keyboard sends a signal to the computer that tells it what letter, number or symbol it would like to be shown on the screen. It is one of the most used input devices for computers.

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The input devices of a VR provide users the sense of immersion and determines the way a user communicates with the computer. It helps users to navigate and interact within a VR environment to make it intuitive and natural as possible. Unfortunately, the current state of technology is not advanced enough to support this yet. Most commonly used input devices are joysticks, force Balls/Tracking balls, controller wands, data gloves, trackpads, On-device control buttons, motion trackers, bodysuits, treadmills and motion platforms (virtual omni).

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A magnetic strip reader is an input device which reads data from a magnetic strip card. The magnetic strip is usually found on the back of the card. The magnetic strip can hold personal details such as account number, name, account balance and sequential number (transaction record number). The strip can contain up to sixty characters, stored magnetically. To read the data on the card, it is ‘swiped’ through a Magnetic Card Reader machine (such as EPOS Machine) and the data is fed back to the computer.

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Smart card readers are used with smart cards which are a type of plastic technology card with a built-in chip used for electronic processes including personal identification, access control, authentication, and financial transactions. Smart card readers obtain or “read” this type of data. Using the chip that is inserted into the reader with the card. Contact smart card readers require that the card is manually inserted into the reader by the user. Contactless smart card readers operate with a radio frequency that communicates when the card comes close to the reader.

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A computer mouse is an input device that is used with a computer. Moving a mouse along a flat surface can move the cursor to different items on the screen. Items can be moved or selected by pressing the mouse buttons (called clicking).[1] Today's mice have two buttons, the left button and right button, with a scroll wheel in between the two. Today, many computer mice use wireless technology and have no wire.

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A signature capture pad is a device that electronically captures a person’s handwritten signature on an LCD touchpad using a pen-type stylus. As a user digitally “signs” a data capture’s LCD touchpad, a sensor “reads” the pressure from the tip of the stylus, transmitting signature data to a computer. Once captured, digital signatures can be imported into and used with most ID software and security programs. Signatures can also be digitally stored for future use.

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A barcode reader, also called a price scanner or point-of-sale ( POS ) scanner, is a hand-held or stationary input device used to capture and read information contained in a bar code . A barcode reader consists of a scanner , a decoder (either built-in or external), and a cable used to connect the reader with a computer. Because a barcode reader merely captures and translates the barcode into numbers and/or letters, the data must be sent to a computer so that a software application can make sense of the data.A barcode reader works by directing a beam of light across the bar code and measuring the amount of light that is reflected back.

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A projector or image projector is an optical device that projects an image (or moving images) onto a surface, commonly a projection screen. Most projectors create an image by shining a light through a small transparent lens, but some newer types of projectors can project the image directly, by using lasers.

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GPS, or the Global Positioning System, is a global navigation satellite system that provides location, velocity and time synchronization.

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A fingerprint scanner system has two basic jobs -- it needs to get an image of your finger, and it needs to determine whether the pattern of ridges and valleys in this image matches the pattern of ridges and valleys in pre-scanned images. There are a number of different ways to get an image of somebody's finger. The most common methods today are optical scanning and capacitance scanning. Both types come up with the same sort of image, but they go about it in completely different ways.

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Speakers are transducers that convert electromagnetic waves into sound waves. The speakers receive audio input from a device such as a computer or an audio receiver. This input may be either in analog or digital form. Analog speakers simply amplify the analog electromagnetic waves into sound waves. Since sound waves are produced in analog form, digital speakers must first convert the digital input to an analog signal, then generate the sound waves.

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In computing, a printer is a peripheral device which makes a persistent representation of graphics or text, usually on paper. While most output is human-readable, bar code printers are an example of an expanded use for printers