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2. 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.

3. 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 ...

4. Logitech - Wikipedia

   en.wikipedia.org/wiki/Logitech

   Logitech International S.A. (/ ˈ l ɒ dʒ ɪ t ɛ k / LOJ-i-tek; stylized in all lowercase) is a Swiss multinational manufacturer of computer peripherals and software.Headquartered in Lausanne, Switzerland and San Jose, California, [2] the company has offices throughout Europe, Asia, Oceania, and the Americas, and is one of the world's leading manufacturers of input and interface devices for ...

5. Action (piano) - Wikipedia

   en.wikipedia.org/wiki/Action_(piano)

   Manufacturers of electronic keyboards, synthesizers, and digital pianos have used various designs to recreate the feel of an acoustic piano. The simplest electronic keyboards, sometimes known as synth-action, use springs to restore each key to its resting position, similar in concept to a computer keyboard, but providing the least realism. [9]

6. Wireless keyboard - Wikipedia

   en.wikipedia.org/wiki/Wireless_keyboard

   Bluetooth keyboards became popular in 2011, coinciding with the popularity of portable devices. [6] [7] Most Bluetooth keyboards have standard qwerty layouts, though some mini Bluetooth keyboards may have a different layout. Bluetooth keyboards are compatible with all the leading operating systems such as Android, iOS, Linux, macOS, and Windows ...

7. Piano - Wikipedia

   en.wikipedia.org/wiki/Piano

   The piano is a keyboard instrument that produces sound when its keys are depressed, through engagement of an action whose hammers strike strings. Modern pianos have a row of 88 black and white keys, tuned to a chromatic scale in equal temperament.