Does anyone know what this is?

It's a cleverly disguised cocaine one hit bullet.
You work with some interesting people.

Looks like an attachable microphone piece

An external microphone. Usually your internal microphone works fine, but if you are attached to an external monitor, and your laptop is closed, this works better.

Most likely a mic. I have a detachable one like that.

External microphone for laptop's microphone till now was not made for a meeting and all. But now, after 2020, we are doing it and external microphone would be very good for that.

I think it's an earphone for listening to music but the audio quality wouldn't be good.

looks to me like a mic.
Did you ever find out what it REALLY is ?

I would have to say it a microphone

A computer 🖥️ cord.🙂