How do I find which WIFI standard my Airport device supports?

My 27" Mac Is about 3 yards old, My new router uses the N standard. How can I find out whether or not my AirPort Extreme supports this standard?
(I know there is backwards compatibility but it's performance issues that I 'm concerned about)
Thanks in advance
David Roberts

Just discovered the info. Can be found by going into 'About this Mac' then 'More info /Network/Airport". Would have thought it should be also found in 'System Preferences'!!
David

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