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  1. #1
    what does the round button with green lights by the headphone jack do?

    Member Since
    Nov 15, 2009
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    what does the round button with green lights by the headphone jack do?
    On a new macbook pro, what does the little round button with green lights by the headphone jack do? Flame away.

  2. #2
    what does the round button with green lights by the headphone jack do?
    Jaygray's Avatar
    Member Since
    Mar 04, 2008
    Posts
    1,115
    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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