Technical Details Enhanced precision with optical engine,eliminates moving parts and dust accumulation. Comfortable fit for either hand and for long-term use. No Driver Required Enhanced precision with optical engine, eliminates moving parts and dust accumulation. Product Details Product Dimensions: 4 x 6 x 1.5 inches ; 1 pounds Here's the latest optical mouse from Genius --- the XScroll, which is easy to use in either hand and easy to install. XScroll says Genius quality, but at a value price. And an all black design will fit elegantly with your PC.With no mouse ball to get dirty, XScroll makes your life easier---no mouse pad required and no cleaning necessary. Even if you use it for a long time, you will still feel comfortable with the XScroll.