Logitech M570 Wireless Trackball Mouse: Easily use your computer for long periods of time with this trackball mouse, which allows you to precisely navigate features with minimal wrist movement. Enjoy lasting comfort thanks to the sculpted shape, which supports the curves of your hand.
I returned the item because of where the ball was located. I didn't realize that the placement really does make a difference. My hand was used to a center ball so switching to the thumb was totally foreign. But while I was trying to make it work for me, I noticed that the cursor was not moving smoothly and would "stick" until I kept moving the ball. That is what happened to my old trackball mouse that was probably 10 years old and finally wasn't working anymore. This one I just pulled out of the package. That is why I gave it a one star.
Logitech M570 Wireless Trackball Mouse: Easily use your computer for long periods of time with this trackball mouse, which allows you to precisely navigate features with minimal wrist movement. Enjoy lasting comfort thanks to the sculpted shape, which supports the curves of your hand.
do you have a left handed mouse?
You will need to get a center ball if you use your left hand. I don't believe Best Buy carries a center ball version. I had to go to Office Depot for the one I got.