The most visible
difference between the two connections is their size. The
3.5 mm jack is almost 50 percent larger than the
2.5 mm jack, but otherwise, they're similar. You'll also notice that the smaller
2.5 mm connection sometimes has an additional ring.
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A small round connector for accepting the pin-shaped plug from certain phone headsets. While 2.5mm was the original standard for phone headsets, the slightly larger 3.5mm size is standard for music headphones and is now the more common size on phones. ...
