Microsoft IntelliMouse Optical USB+PS/2 Optical 400DPI Black mice

IntelliMouse Optical, Black Easily navigate documents, Web pages, and spread sheets with the convenient scroll wheel and Internet navigation buttons. Work on any surface while you easily navigate documents, Web pages, and spread sheets with the convenient scroll wheel and Internet navigation buttons.

Optical Technology
Navigate with better speed, accuracy and reliability—the optical sensor tracks movement on nearly any surface without the hassle of clogged mouse parts.

Ergonomic Design
Point and click in comfort—ergonomic design helps you work longer without discomfort.

Comfortable in Either Hand
Use your mouse with your left or right hand—ambidextrous design makes it comfortable either way.

Internet Hot Keys
With the touch of a button you can quickly access the Internet.

Additional Features:
-Scroll Wheel.
-Customizable Buttons.