Quick alienware m17x question

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Joined
19 Mar 2011
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842
on the left side of the m17x there is are 3 sockets

1 is for mic
1 is for headphones

now the 3rd has a headphone symbol and works with headphones, however it is not listed in the m17x used guide.

so why 2 headphone sockets??

thanks
 
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