2.5mm Headset Jack

A small round connector for accepting the pin-shaped plug from a standard phone headset. This jack can be also be used with accessories such as a wired hands-free car kit with speakerphone.

While 2.5mm is the standard for phone headsets, the slightly larger 3.5mm size is the standard for music headphones and devices other than phones.

See: Headphone Jack (3.5mm)

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

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