Kensington Slimblade Trackball Mouse Wired ProfessionalDescriptionSpecificationsShipping Comfort and productivity are at your fingertips with the SlimBlade Trackball. Your computing experience gets smoother, faster and easier with a ball that can do it all. In addition to the usual productivity gains that come with a trackball, with a simple twist of the ball, youll be scrolling up and down pages. It offers better ergonomics, with less wrist and hand movement that will ease the pain of repetitive stress