what does the round button with green lights by the headphone jack do?

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F131


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On a new macbook pro, what does the little round button with green lights by the headphone jack do? Flame away.
 
Jaygray

Jaygray


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Your Mac's Specs
Unibody MacBook Pro 2.26, 4gb RAM, 500gb HD
It's a battery indicator. The number of lights that light up shows the amount of charge remaining. Mainly useful to check the battery's charge while the machine is not running.
 

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