Microsoft D67-00001 Wireless Trackball Optical Mouse - Ergonomic USB Computer Mouse for Office Work, CAD Design & Gaming (Black)

Amazon.com Unlike the mechanical-trackball "mice of yore" that skip, stick, and need to be cleaned, the Microsoft TrackBall Optical introduces an entirely new trackball featuring optical sensor technology. Reading through dirt, dust, and fingerprints, the optical sensor tracks the movement of the ball 1,500 times per second, giving you smooth, precise control. The Trackball Optical comes with two additional buttons located on the side of the device--for a total of five buttons--to quickly move forward and back in your browser, or you can program them. It also features a wheel for efficient scrolling and zooming and is ergonomically designed to support the natural position of your hand as you use your thumb to control the trackball. 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.