Here is my review of this product. It is incredibly light-weight, so it flies on your mousepad. It has a grand total of four buttons. These include right click, left click, scroll wheel, and the sensitivity button located directly below the scroll wheel. The sensitivity only has four options (400, 800, 1600, 3200), which you can customize and rotate between two options via the SteelSeries Engine Driver. You also have a polling rate that you can alter, which consists of 125, 250, 500, and 1000 Hz.
Personally, I'm dissapointed with this mouse. I didn't like the fact that it was so light. The big thing that bothered me about it was the sensitivity options. The option I use is 1600, but that setting is just a shade too high for gaming. Even if you turn the setting down to 800, then it is far too low. For $20, I can't really complain. I got what I paid for. Anyone else looking to buy this may be better off buying something like the Logitech G500. This mouse is more of a quickie replacement.