FREE: 3.5 mm adapter (Great condition!)

The listing, 3.5 mm adapter (Great condition!) has ended.

Ok, so I don't know much about this except it is definitely an adapter of some sort.

One end is a 3.5 mm jack. 100% positive about that. Now the other end (2nd pic) is what I'm unsure about.

I did put my headphones in the other end and then attached the whole thing in my ipod and I was able to hear sound normally.

So, I'm thinking the opening in 2nd pic does fit a 3.5 mm jack (it does fit), but I FEEL like it would maybe fit some other size better? Honestly, I really have no concrete idea and all I know I have written. I think it might be cell phone related, once again, just a hunch based on searching the internet.

Anyways, feel free to comment. You can ask questions but might not be useful because I really wrote everything I know.

This is used, but in good condition. (was in a box of stuff that I was cleaning, maybe a guest left it?)

Free shipping! Thanks!