Styles that are now in favor
The optics position is dependable
Needs a smooth kind of surface
Roll a roller for scrolls technique, two-directional arbitrarily scrolls
Comfortable key touch, the finger long time usage yet not tiring
Key lifespan: 1,500,000 times
PS/2, USB, and combo (U+P) available
Resolution: 800DPI (3,000 frames/second)