How to know my macbook pro supports usb2 or usb3?

How to know my macbook pro supports usb2 or usb3 ?
And if it is USB 2, will external hardisk which support usb 2 would be compatible with & vice-versa?
What would be the cons?

USB 3.0 ports were only added to those MacBook Pros that were released in mid 2012 and later.
So you would have USB 2.0 ports on your machine.
But USB 3.0 and 2.0 are 'compaitble,' somewhat - you just won't be able to get the throughput of a USB 3.0 to USB 3.0 connection.
Clinton

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