Well, I wanted one of them to be a relay of some sort, so I knew that 3 wasn't it, because it's only got 2 leads. #1 has some sort of coil inside, so I was wondering if that was an electromagnetic coil for a relay, but I guess not.
I was mostly curious as to what they are because I've got a ton of them on a radio-controlled plane board that I'm scrapping, and was wondering if I could put them to use. I can't think of anything involving them now, but as soon as I throw them away I'll wish I had them, so I'd better hang onto em. :