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How does my iPhone know which set of headphones I'm using?
I have two pairs of headphones I use with my iPhone, the pair that came with it and a pair of Ultimate Ears. Now with the Apple pair I ussually have the volume turned up high and with the ultimate ears I have the volume much lower. I’ve just noticed that when I swap between them the iPhone automaticlly changes the volume. How does it know which pair is which?
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