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Glide over a variety of surfaces with speed and accuracy using the new HP PS/2 Mouse for the latest advancements in optical tracking technology.Optical tracking - Get precision movement with a tracking system that works through light for less moving parts and greater durability than ball-based mice.The optical sensor within the HP PS/2 2-Button Optical Scroll Mouse employs a resolution of approximately 800dpi.Left-handed or right-handed users can enjoy a contoured shape that suits either preference, with a wheel that also functions as a third button.