Kensington Technology Group presents its TurboRing Trackball. It is powered for work and contoured for comfort. ScrollRing technology - state-of-the-art scrolling system is created specifically for use with trackballs. Naturally positions hand will help you work more comfortably and productively. It also features large ball for easy fingertip control and precision pointing. Three customizable buttons deliver one-click solutions to such repetitive tasks as open/close, cut/paste, double-click, and more.