Rare SEALED Microsoft Trackball Optical Mouse D67-00001.

Will consider reasonable offers!!! :)

Can't hurt to ask.

From the Manufacturer

Get on the ball at an affordable price. This high-performance trackball offers optical precision, customizable buttons, and a convenient scroll wheel for easy navigation.

Optical technology refers to the use of an optical sensor to track mouse movement, rather than the traditional use of mechanical parts. As a result, optical mouse products work on most surfaces and offer you better durability, increased speed and accuracy, and consistent performance.

Every Microsoft hardware product has met the company's rigorous testing requirements for unparalleled comfort and performance. Ergonomic design is important for more than productivity—how you type, point, and click can also affect your long-term health.