Features: *Ergonomic design, which is more fit to your palm and fingers, takes more convenience for uage. *High-precision optical engine makes scrolling more efficient and convenient. *3 buttons design ( left + right + wheel button) is the best choice for desktop and lap-top. Technical Data: *Resolution: 400/620/800CPI available *Plug&Play *PS/2,USB and combo port available. System requirement: *IBM PC Pentium 400 compatible or higher *Windows XP/Me/2000/98