Scroll wheel
Component of a computer mouse used for scrolling / From Wikipedia, the free encyclopedia
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"Trackwheel" redirects here. For a system of vehicle propulsion, see Continuous track.
A scroll wheel is a wheel used for scrolling. The term usually refers to such wheels found on computer mice (where they can also be called a mouse wheel). It is often made of hard plastic with a rubbery surface, centred around an internal rotary encoder. It is usually located between the left and right mouse buttons and is positioned perpendicular to the mouse surface. Sometimes the wheel can be pressed left and right, which is actually just two additional macros buttons.
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