“What is the extra little hole for close to the cable connection on the earbuds themselves? (Front goes in your ear for sound, the backpanel has the ambient sound mics, so I get those, but right next to the cable in, on the barrel itself is a 3rd opening?)”
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Hi, FearNaBoinne! You may visit this link below for the parts and control of the headphones. https://helpguide.sony.net/mdr/wi1000x/v1/en/contents/TP0001513141.html?search=parts Happy to help, David
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