To find out your Mac model:
1. Visit Apple official website for detailed model information.
Macbook Air: http://support.apple.com/kb/HT3255?viewlocale=en_US
Macbook Pro: http://support.apple.com/kb/ht4132
Mac mini: http://support.apple.com/kb/ht3476
2. Find Mac Model Identifier at:
About this Mac → More Info → System report → Model Identifier
If the answer can't help you, you can contact the Tech Support Department