Specification:

(1) 3D Scroll / Optical mouse
(2) USB / PS2 compatible
(3) Resolution: 800DPI
(4) 3 Buttons

Feature:

(1) 3D optical mouse with scroll wheel
(2) 800 dpi optical sensor for precise tracking
(3) Comfortable fit for either hand and for long-term use
(4) Compatible with windows 95/98/2000/NT/XP