1.Interface ： PS2,USB(optional)
2.Ergonomic & Comfortable design with good handle
3.Compatible with Windows 95/98/2000/NT/ME/XP ect.
4.Color Printing ：all colors availuable(optional)
5.High Resolution ：500-600-800dpi
6.Keystroke lifecycle over 1,000,000 times
7.Advanced trackball technology can make cursor precisely locate even when you move quickly