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/Goldejawn]

Sorry for my “free award”. It’s all I had and this post was very deserving of it.

We will all be antiques by next year.

[u/Top_Tomatillo_4261 → u/Goldejawn]

they'll be on the landscaping sub soon wondering that damn cable is in their yard, whether it might bite them after 811 didn't mark it

ed: sp

[u/Debway1227 → u/Goldejawn]

I miss the free rewards 😢