Ergonomic design Plug and play-USB Super natural wheel For either hand control Mirror treatment on upper surface Disco light (option) for wheel System requirements 10-key advanced mouse Buttons: L, R, W, 1, 2, 3 buttons: with same functions as a conventional mouse 4, 5: two thumb buttons can easily move back and forward between pages on Internet 6, 7: accelerator cruise for long documents or Websites which provides fast and continuous up and down scrolls 8: switch application, click and hold the button to switch the view between programs and documents 9: close application by clicking the button to close the active program or document 10: my computer provides direct access to 'My Computer' immediately