The optical sensor technology is a significant improvement in computer mice. By replacing the rolling ball and all the moving parts that were previously necessary for translating movements, the mouse becomes more durable and precise than any traditional ball mouse could ever be. No more unpredictable mouse movements. The optical sensor transmits 800 signals per second to the digital signal processor, which helps avoid unwanted jumps that can regularly occur with ball mice. No cleaning required. The reduction of moving parts leads to minimal dirt accumulation, making the optical mouse virtually maintenance-free. No mouse pad needed. The mouse is so precise that it can be used on almost any smooth surface. Easy side navigation. The scroll wheel allows you to effortlessly browse through documents and the World Wide Web.