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Apple Notebooks Apple's notebook computers including MacBook Pro, MacBook, MacBook Air, PowerBook, and iBook.

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

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Member Since: Nov 15, 2009
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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.
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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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