Reliabie Optical technology-nomouse ball!
Faster wheel scrolling
No mouse Pad Required-Gives Smooth. Precise
Motion On Virtually Any surfase
supperior Optical technology-nomouse ball!
Scroll wheel for easy Navigation
3D internet Wheel . Faster Wheel scorlling
Agree with The palm Arc. comfort for either hand
3D internet Wheel . Keying two unite one design.
800DPI Optical point
Never use Scrollars again
No Driver Required
interface : USB
Support OS : windows ME , 2000,  Vista , XP, Windows 7 , PE , MAC and linux

Size:  approx. 55x105x30mm (WxLxH)