Apple MACBOOK - Manual (Page 101)

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Specifications
You can use System Profiler to find out detailed
information about your MacBook.
You can find out the amount of built-in memory, hard disk size, devices connected, the
product serial number, and more. To access the information in System Profiler, choose
Apple () > About This Mac from the menu bar and then click More Info, or open
System Profiler, located in /Applications/Utilities/.
Click the triangles in the window
to show and hide information in
the different categories.