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.