This is probably one of the crappiest, expensive keyboards I have used. It takes 4 AA batteries that die quickly. There is a slight lag on keystrokes, and it gets dirty very quickly. The keyboard only works with Mac OS X 10.2.6 or later (not that it matters, not many people are using that old of an operating system), and it only works on Mac.
My keyboard i stopped using after few months because I had a lot of connectivity issues, it would constantly stop working and I would have to repair it with my computer to use it.

Overall, I would stay away from this model and look into the current model which is far superior to this one.