content: ****I HAVE NEVER WRITTEN A REVIEW UNTIL NOW.....I have been using track balls for a long time now to reduce the strain on my wrist. It seems the styles keep changing...This one looks so cool and it's BIG. Got it right away and hooked it up, it must take some time to get use to it....after about 30 min my wrist hurt so bad I had to get off the computer. If I have alot to do on the computer I use my logitech. As a matter of fact I won't even use the Kensington. I would suspect a carpal tunnel law suit in their future. Perhaps the slim line one is better...I haven't tried it. Wish I could return it...too late. ***DO NOT BUY***