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Using the latest optical sensing technology, the HP USB Optical Scroll Mouse records precise motion over a variety of surfaces without a mouse pad. The optical tracking reduce sticking and constant cleaning -- a system that works through light, with less moving parts for greater durability than ball roller-based mice. You will benefit from the smooth, contoured shape that fits either hand and a wheel that functions as a third button. 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.