Kensington K72243 Si300 Laser Wired Mouse for PC or Mac Laser mouse designed for either left- or right-hand users, with flexible rubber grips for comfort and control Four-way tilt-scroll wheel that lets you move side-to-side or up and down quickly and easily, and three individually customizable buttons Advanced laser tracking that works precisely on almost any surface, with 20-times the surface sensitivity as an optical mouse Backed by Kensington's five-year warranty and free technical support Measures 2.75 x 1.25 x 5 inches (WxDxL)