I purchased this mouse because of the low price and good ratings. I really don't know how it got the good ratings. I am very disappointed in it. First of all, the USB transmitter is about twice the size of the Logitech mouse that I had. I'm always hitting it with my arm while I work. The worst part is that it keeps falling out of sync with the mouse and stops working, even though the mouse is about 6 inches from the transmitter.It's very possible that I just got a bad one, but I would suggest paying a little more for something that will work well right out of the box.