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2. Keyboard technology - Wikipedia

   en.wikipedia.org/wiki/Keyboard_technology

   Some optical keyboards use a special key structure that blocks the light in a certain pattern, allowing only one beam per row of keys (most commonly a horizontal beam). The mechanism of the optical keyboard is very simple – a light beam is sent from the emitter to the receiving sensor, and the actuated key blocks, reflects , refracts or ...

3. List of mechanical keyboards - Wikipedia

   en.wikipedia.org/wiki/List_of_mechanical_keyboards

   Mechanical keyboards (or mechanical-switch keyboards) are computer keyboards which have an individual switch for each key. The following table is a compilation list of mechanical keyboard models, brands, and series:

4. List of keyboard switches - Wikipedia

   en.wikipedia.org/wiki/List_of_keyboard_switches

   1 Commonly used mechanical switches on pre-built keyboards. 2 Mechanical keyboard switches for custom keyboards. ... Red (Optical Switch) [16] Cherry MX Red: Linear ...

5. List of Logitech products - Wikipedia

   en.wikipedia.org/wiki/List_of_Logitech_products

   Among the first proper wireless mechanical keyboards, and the first one from a major, popular manufacturer. Romer-G switches are without RGB lighting to improve battery life Can connect up to two devices via 2.4 GHz wireless and Bluetooth, also compatible with iOS and Android devices as a keyboard input. G513 Carbon Mechanical Gaming Keyboard 2018

6. Input device - Wikipedia

   en.wikipedia.org/wiki/Input_device

   A common computer input device, a keyboard. A user presses a key which transfers information to a computer. In computing, an input device is a piece of equipment used to provide data and control signals to an information processing system, such as a computer or information appliance.

7. Text entry interface - Wikipedia

   en.wikipedia.org/wiki/Text_entry_interface

   A light pen can also allow users draw on the screen with great positional accuracy. It consists of a photocell and an optical system placed in a small tube. When the tip of a light pen is moved over the monitor screen and pen button is pressed, its photocell sensing element detects the screen location and sends the corresponding signal to the CPU.