RAPOO N100 Wired Optical Mouse - Easy Installatin: No driver required, just plug it in and go. Life can be that easy. - 1600 DPI high-definition tracking engine: You’ll enjoy responsive and smooth cursor control with the 1600 DPI high-definition optical tracking engine. - 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. Link: http://www.rapoo.com/product/442