<b>Scroll Ring and Medium Ball</b><br><br>Spin the dial to move up and down web pages or documents with complete ease. The blue 40mm ball has been specially designed with an absolute spherical, hard surface for precise tracking and control<br>Scroll Ring and Medium Ball<br>Optical Tracking Technology<br><br>Provides precise cursor movement for superior accuracy so you can get where you want on the screen quickly with less hand movement, improving productivity and efficiency<br><br><b>Detachable Wrist Rest</b><br><br>Soft cushioning cradles the hand and wrist in ergonomic comfort for pain-free productivity during extended periods of activity on the computer<br><br><b>Ambidextrous Design</b><br><br>Works equally well for both right-handed and left-handed users to get the most out of their trackball<br><br><b>Plug & Play Installation</b><br><br>Quickly get clicking and scrolling with fast, simple installation through the reliable wired USB connection, plus it doesn’t need batteries<br><br This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5895-01-362-3252, indicating validated use in U.S. government and defense logistics supply chains.