1.With the digital mode ,analog mode and negcon mode 
2.Be able to alter height and gradient to suit the position  you want
3.Bigger cupule to stick to the desktop firmly
4.180 circumgyration leading to more  actualer feeling and easier control
5.With foot pedal and hand brake (optional)
6.Compatible with with win 98/2000/nt/xp/vista/win7 system
7.Available in different colors