I discovered a new button

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Just recently I discovered a new button on the lower left side of my Macbook Pro. It is a small circular button that when pressed produces a series of green lights. Anyone know what this is? Something to do with wireless network?
Thanks
 

bobtomay

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15" MBP '06 2.33 C2D 4GB 10.7; 13" MBA '14 1.8 i7 8GB 10.11; 21" iMac '13 2.9 i5 8GB 10.11; 6S
That is your battery charge status.
 
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lol... yeah it tells you how much battery power you have left... so you don't have to power on to check how much battery u have.
 
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lol... yeah it tells you how much battery power you have left... so you don't have to power on to check how much battery u have.

It's on the left side (as opposed to the bottom in previous MB and MBP generations) so you don't have to flip your Mac over to see it.
 
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Thanks!

lol... yeah it tells you how much battery power you have left... so you don't have to power on to check how much battery u have.

I'm a bit new to mac, and decided to convert from windows "officially." :D
 

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