OK this is probably a really dumb question, but I haven't been able to google my way out of this.
I have some headphones I want to ensure do not have a mic. I'm 99% sure they don't, but to be cautious I plugged them into the microphone jack to see if I could get the "Test your microphone" bar to show output.
In Windows 10 sound settings, I was able to make it show output when I thumped the headphone speaker. Odd I thought. So I tried it again with plain old ear buds that definitely can't have a mic (no little bar along the wires). Same thing happened, thumping the ear bud showed output.
Does anyone know why this could happen? Am I crazy and maybe these devices due have a mic embedded?