High-precision Laser sensor: Enjoy accurate & smooth tracking on virtually any surface. 800/ 1600 DPI adjustable: Point & click the switcher to change 1600 or 800dpi quickly. Back & Forward Buttons: Quicken surf the internet & document through back & forward buttons. Ambidextrous: Total comfort with either h&. Stylish shape with finger grooves: Stylish shape with soft rubber grips & finger grooves give you a superior grasp.