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Rating: 
Summary: Trackball doesn't work
Review: If you want a cheap optical USB mouse, then this is ok. If you're getting this because you want a portable/small trackball mouse, then look elsewhere.I tried this on three different computers (with Windows XP and 2000), and as a regular optical mouse, it worked fine, but once you switched over to trackball (read the instruction manual, don't throw it away!), then all I could get out of the trackball is a short, jerky left and right motion -- it wouldn't move up and down at all! The responsiveness of the so-called '4D' scroll ball was sluggish, when I had it in standard mouse mode. If you want a trackball, I'd recommend Logitech. If you want something portable, Targus also makes one similar to this that I haven't tried yet. Good luck!
Rating:
Summary: Trackball doesn't work
Review: If you want a cheap optical USB mouse, then this is ok. If you're getting this because you want a portable/small trackball mouse, then look elsewhere. I tried this on three different computers (with Windows XP and 2000), and as a regular optical mouse, it worked fine, but once you switched over to trackball (read the instruction manual, don't throw it away!), then all I could get out of the trackball is a short, jerky left and right motion -- it wouldn't move up and down at all! The responsiveness of the so-called '4D' scroll ball was sluggish, when I had it in standard mouse mode. If you want a trackball, I'd recommend Logitech. If you want something portable, Targus also makes one similar to this that I haven't tried yet. Good luck!
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