Optische 5 Tastenmaus mit Scrollrad als Combo Version (USB/PS2) 800dpi

Key Features:
-With the optical technology, the motion can be
  detected on most surfaces, including wood,
  plastic, paint, etc.
-5 buttons are available.

Specification:
- Optical Resolution (dpi): 800
-Scroll Wheel: YES
-Button: 5
-Interface: YES
-Operating System: Win 98/ 2000/ ME/ XP