Experience trackball precision without the cords. Optical Marble ® technology tracks smoothly & is virtually maintenance free. WebWhee ™ software along with forward & back buttons take the effort out of Web & document browsing. Features scroll wheel & 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 & smart power management providing over six months of battery life. Connector / Port / Interface: PS / 2; USB; Left / Right Hand Use: Right; Mouse Technology: Optical; Trackball; Wired / Wireless: Wireless.