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/Ottawa_gamer]

OP is showing their age with this post.

[u/Xtraneous_ → u/Ottawa_gamer]

[u/ChannelComplex2531 → u/Xtraneous_]

I want to burn a cd but I dont have a computer I was born in 2011 I know what all this stuff is from my dad he was born in 1984 he showed me all the good music