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Title: Kensington Expert Optical Trackball Mouse
Review: Had an older version and loved it. Change to newer computer and went back to regular mouse and really missed it and so I got the newer version. Love this one even more because this uses optical vs mechanical that the older on had. Had to clean it regularly since dust would hamper trackball movement, not so with the optical version. Added scrool ring that the older version didn't have is nice.
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