this post was submitted on 08 Sep 2023
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Btw, what you're looking for is headphones with a "TRRS" (not TRS) jack/cable. Look for that in the specs, or find a photo of the plug and make sure it has exactly three (usually black) rings. (TRS will only have two.)
Your instructions are completely correct, but it might make more sense to look at the bands of metal rather than the insulator between them.
TRS stands for "Tip, Ring, Sleeve", referring to the 3 contacts on a TRS jack - one for the left channel, one for right and one for ground. TRRS as you might guess has an extra ring to provide a contact for the microphone as well. So you're looking for the metal tip, two rings of metal and then the metal sleeve.
True and technically correct. I just tried to simplify it to "Know the plug? Metal? Count how many things you see on it."