Kensington 72257 Ci20 Optical Mouse for PC or Mac Optical mouse with a right-hand optimized design and soft, rubberized grips for comfort and control Five customizable buttons that can launch favorite applications, navigate websites, and streamline important tasks Utilizes DiamondEye optical technology to provide unmatched accuracy, acceleration control and tracking precision Comes with award-winning MouseWorks software, as well as Kensington's five-year warranty and free technical support Measures 3.25 x 1.5 x 5.25 inches (WxDxL)