How to check if my MBP supports Airplay?

Hi I have a 15'' MBP from march ish 2011. I just updated my OSX to Mountain Lion 10.8.2 because I was thinking about buying apple tv 3rd generation.

But I'm not sure, that my computer supports the Apple TV mirroring? How can I check this? I know that everybody writes that the mirroring is supported by MBP purchased from early 2011 (I guess this means mine to?), but how can I check this myself so I don't order apple tv, and it doesn't work. Can I do some kind of test or see it in the specs somewhere?