6 buttons， including Wheel Key， Left Button， Right Button， Page up， Page down， DPI Switcher High speed: 1000dpi， 1600dpi， 2000dpi， use the small 'DPI' button to switch the speed Elegant and ergonomic design， perfect to match your laptop or PC The Max DPI: 2000DPI.  Ajustable DPI Switch: 1000DPI/ 1600DPI / 2000DPI Compatible with PC， Mac， windows XP， and Vista and Win