Please make sure your computer meets the requirements described in the before completing the purchase, any retail box that is opened is not eligible for return, the return request will be rejected!Product DescriptionUnlike 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 productive — how you type, point, and click can also affect your long-term health.

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Shipping:I Receive your payment and your order will be shipped (withTrackingNO.)the same or next day, I only ship to confirmed Payment addresses. Your Payment address MUST MATCH your Shipping address.

• My store returns policy:
  30 days money back, buyer pays return shipping.Please research the software title you are interested in prior to completing the purchase. Make sure your computer meets the system requirements described in every item and be sure to note the packaging details included in the description of every item we sell.We accept returns on all software and hardware provided the item being returned is unopened, in its original packaging/condition, includes all supplemental materials and it's within 30 days of your original purchase date.
  Any software was been opened not qualify for return and return request will be denied!