Experience trackball precision without the cords. Optical MarbleÂ® technology tracks smoothly and is virtually maintenance free. WebWheeâ„¢ software along with forward and back buttons take the effort out of Web and document browsing. Features scroll wheel and customizable buttons that allow you to personalize your controls for increased productivity. Digital radio technology requires no line of sight for true cordless freedom. Innovative extras include exclusive cruise control and smart power management providing over six months of battery life.