1. Accurate and believable optical positioning 2. Moving smoothly on any surface 3. Nice appearance,emit 7 color light, comfortable in use 4.USB+PS2 port 5. The completely new concept of the optical technology 6. 800dpi 7. Win95/98/ME/NT4.0/2000/XP 8. 3D roll function 9.bule light of mid-roll whell 10.industrial design caccording to body of people Packing:gift box with blister