Kensington Pro Fit® Ergo Vertical Wireless Trackball-White (K75263WW)

Ergonomist-approved design promotes proper wrist, arm, and shoulder alignment to maximize comfort and minimize potential strains. Easy-to-use mouse-like shape reduces learning curve when transitioning from a mouse to a trackball. Provides more accurate and smooth cursor control, and allows you to easily switch between DPI settings for different cursor speed control. Flexible wireless connection options allow stable connectivity for up to three computers. Use the plug-and-play default settings, or download KensingtonWorks software to set pointer and scrolling options and professionally customize nine buttons to tackle common tasks with one touch.Unique easy-to-clean design features a button to eject the trackball for easy cleaning.Long battery life delivers up to 18 months on two AA batteries (included). The battery indicator light eliminates surprises. Battery life may vary based on usage.