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printed May 23, 2013
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Headphone Jack (3.5mm)

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A small round connector for accepting the pin-shaped plug from a standard pair of music headphones.

Older phones used a smaller 2.5mm jack for phone headsets.

See: 2.5mm Headset Jack

Either size can support stereo sound and/or a microphone, depending on the number of separate connector rings on the plug or jack.

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