Specification (1) 5D Scroll / Optical mouse (2) USB Interface (3) Resolution: 800DPI (4) 20PCS/CTN Feature: (1) 4D optical mouse with scroll wheel,special Vivid mouse shape design (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/XP (5) Laser Mouse Optional (6) Black & silver colour will fit elegantly with your PC