The adapter that has 2 ports coming out - i.e. with a 2.5mm output - this is a headset adapter - i.e. works with a headset that has audio and mic. The adapter with 3 ports was and is NOT designed as a headset adapter - only as an audio only (hence why 3.5mm output). I found this out when trying to hook my motorcycle helmet audio up and then experimented. Oh well.
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