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3.5 mm jack

See mini-phone connector.

mini-phone connector

Also called a 3.5mm or 1/8" connector, it is a plug and socket widely used for analog audio signals in portable devices. For example, the headphones jack on iPods, tablets and portable DVD players is a mini-phone socket.

2.5mm Sub-Mini Phone
The smaller "sub-mini connector" with a thinner shank (2.5mm - 3/32") has been used on cellphones and other compact devices. See phone connector, RCA connector, A/V ports, Lightning to 3.5mm adapter and plugs and sockets.

You Can Tell By the Plug
Plugs with two divisions (TS) are monaural, while three divisions (TRS) are stereo. Headset plugs have a fourth line (TRRS) for the microphone. Smartphones accept both three-wire cables for headphones and four-wire cables for headsets. See tip and ring.

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