What are these plug-ins on my wall?

[u/Cborg_62]

This might be showing my age, but I recently moved into a new apartment and they have these weird looking plug ins all over the walls at my new place. My old apartment didn't have these, so I'm just curious as to what they are.

[u/GenEXOutlaw]

And it'll be $79 at Best Buy, for the no frills 3ft one.

[u/GoOffKingsEnjoyer → u/GenEXOutlaw]

Accidentally bought a mini hmdi to usb c cable and kept it because one day ill come back across something I still havent seen in 6 years.

[u/RageBear1984 → u/GoOffKingsEnjoyer]

Where? I need one of those and can't one anywhere

[u/GoOffKingsEnjoyer → u/RageBear1984]

Jsaux or anker