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headphones are output but if they have a built in mic then they either must be plugged into the microphone slot on a computer or are able to be plugged into USB which allows back and forth data transfer. Some like the apple earphones have a built in mic which allows the user to input audio data in the one predominantly output slot due to its specific construction. I'm not sure but this ability may be available on other newer devices.

Source: Tinkerer and Maker of Things
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12y ago

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