[WARNING] Don't buy this mouse. It uses an optical sensor that does not track well. For example, open up a program like Paint and try to draw a diagonal line. You will instead get a random diagonal stair step pattern.
I was a sucker and bought the Corsair mouse to replace my Razer Naga, which uses a precision laser for tracking. At first I didn't understand why the mouse didn't track properly. I tried firmware and software updates, new mouse pads, and even replaced the mouse with a new one. I finally found out that Corsair uses sub-standard optical tracking that is highly imprecise. It's a shame, because everything else about the Corsair mouse is great. Corsair screwed up the most basic function of a mouse: accurate tracking.