<ul><li>Reduce sticking and constant cleaning with optical tracking - a system that works through light with less moving parts for greater durability than ball-based mice</li><li>Users benefit from a smooth, contoured shape that fits both hands - and a wheel that functions as a third button</li><li>The optical sensor within the HP USB optical scroll mouse employs a scan rate of 800dpi and enables crisp motion without a mouse pad, ball or roller</li><li>Left-handed or right-handed users can enjoy a contoured shape that suits either preference</li></ul> The HP USB optical mouse utilizes the latest optical sensing technology, recording precise motion over a variety of surfaces without a mouse pad.<br /><br /><p> </p>