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Why You Should Use A Trackball Instead of Mouse or Trackpad - Tech for Anyone
n-ABLER Trackball | Pretorian Technologies
Computer Repairing Hub - A trackball is a pointing device consisting of a ball held by a socket containing sensors to detect a rotation of the ball about two axes—like an upside-down
Kensington Orbit Trackball with Scroll Ring review: Kensington Orbit Trackball with Scroll Ring - CNET