Genius NetScroll 100 Mouse - Optical - Cable - 3 Button(s) - Black, Silver - PS/2, USB - 1200 dpi - Tilt Wheel - Symmetrical. High-precision optical mouse The latest optical mouse from Genius --- the NetScroll 100, is sure to add style to any desktop, plus it fits great in either hand. NetScroll 100 says Genius quality---elegant style in silver --- but at a value price. The setup is very easy --- all you need to do is plug it in. With no mouse ball to get dirty, NetScroll 100 optical mouse makes your life easier---no mouse pad required and no cleaning necessary. With the 800dpi optical resolution, even if you use it for a long time, you will still feel comfortable with the NetScroll 100.