RAPOO N100 Wired Optical Mouse - Easy Installatin: No driver required, just plug it in and go. Life can be that easy. - The high-performance 1000 DPI optical sensor offers you smooth and accurate mouse-pointer control. - Anti-slip scroll wheel: Scroll up and down function greatly facilitates your daily work or web browsing. The anti-slip pattern on the scroll wheel ensures fast, easy and accurate scrolling. - Full-size, ambidextrous design: designed to suit either hand. With the full-size shape, you are not easy to get tired even for hours' operation.