Kensington Pro Fit Ergo Vertical Wired Trackball (K75256WW) Give your hand a healthy break. Upgrade to ergonomist-approved comfort and premium cursor control with Kensington s Pro Fit Ergo Vertical Wired Trackball. A 60 tilt angle promotes proper wrist, arm, and shoulder alignment to maximize comfort and minimize potential strains. This mouse-like vertical trackball is easy to learn and offers nine programmable buttons; plug-and-play ease with the ability to customize using KensingtonWorks software; and a unique, easy-to-clean design. Product Features 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. A secure wired connection means youll never worry about batteries or wireless interference. 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.