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What's the purpose of this dongle??
It's a digital to analog audio convertor for USB it looks like.
If it also does analog to digital this might make sense as a way to verify sound output.
I.e. debug a program that uses the headphone jack, or workaround software loopback device limitations.
Given the white body, it could be a USB cable for one of the early iPod shuffles?
It is exactly that. Really simple cable too. All of the apple 3.5mms are 4 pole (I think for play/pause, track seek capability) so it’s just a USB connector in a different form factor.
It isnt Left/Right/Ground/Mic? Ill dont know how the skip/pause stuff is done, will do some more research
Edit: https://electronics.stackexchange.com/posts/38492/revisions
Signalling done on mic wire.