The ASUS VivoMini VC66R has only one socket for an audio jack:
How can I tell whether this will support only audio-out (headphones), or combination audio in-and-out (in which case I can use an adapter/socket splitter)
I wrote ASUS support, and they say:
Dear sir/ madam,
Thank you for your email.
This device makes use of a so called combo jack. These jacks do no allow the use of normal microphones as the connection is different from a normal 3.5 jack.
So apparently it's not just audio out. I'm still not 100% sure I should take their word on it, but this was pretty explicit.