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Title: Not worth the money.
Review: This mouse is incredibly jumpy if it's not on a completely flat surface. It "functions" but I continuously have to fight with it to get the pointer to line up with what I want to click on. Also, if you set it down and try to type much like I am doing now, the cursor jumps around wildly on it's own. It's worthless as a portable mouse. It will not work at all on a knee that is uncovered or very well on any imperfect surface. I would send it back, but as it happens, my once faithful mouse that I originally used (I ordered this as an extra) decided to give up the ghost the day after I got this one.
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