If I remember correctly, it accepts 100~240V over 50~60Hz. I've used mine in the US and many European and Asian countries, and it always worked fine. I bought AC adapters in the US and Japan, and it doesn't seem to make a difference either. Make sure you have the right plug adapter so it fits outlets in your country though.
Also, it might be better to go to Apple.com before asking such a question. I'm pretty sure there's the answer over there. It's way more reliable than a random guy on the internet anyway.