All the ergonomic benefits of a small wrist rest, but with the added convenience and control of an embedded track ball. Whether or not you are actively typing, the wrist rest will support your wrists and relieve pressure on the median nerve (the cause of pain in carpal tunnel and other RSI). Trackball is IBM compatible and nestles between the dual wrist rests �€�€� the trackball is low-profile and may be used for easy point, click, and drag operations in all Windows-OS software environment. USB Connection Windows 95-XP Compatible