Kensington Orbit TrackBall - Wired Ergonomic TrackBall Mouse for PC, Mac and Windows with Ambidextrous Design, Optical Tracking & 40 mm Ball – Space Grey (64327EU), Silver : Amazon.co.uk: Computers & Accessories
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Why did ball mice go obsolete? They seem superior to optical ones. a ball mice don't need a mouse pad, can work on any surface, and have good weight. Optical mice are
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This spherical mouse for Generation Z is an everyday accessory + stress ball rolled into one! - Yanko Design