Trackball Mouse,YUMQUA Y-10 Handheld USB Wired Finger Mice Fits Left and Right Handed Carpal Tunnel Users for PS/Windows/XP/NT/ME It can be operated in various ways to ensure long-term use without harm to wrist or muscle Plug and play ,no software required Fits left and right handed users Works well for browsing and reading It took a little time getting used to using the trackball but after a while it feels natural.