Give your hand a healthy break. Upgrade to ergonomist-approved comfort and premium cursor control with Kensington's Pro Fit Ergo Vertical Wireless Trackball - White. 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; wireless connectivity for up to three computers; plug-and-play ease with the ability to customize using KensingtonWorks software; a unique, easy-to-clean design; and long battery life.