Uhhh what's this

So we have owned our for a close to three years. In this three years we have completely remodeled the entire home. And amazingly...I still don't know what this is for...

Last night I was walking around the house. Just doing the regular stuff, i.e. watering plants. And then I noticed it...what's this????? I thought to myself. No lights were turning on & nothing was shutting off....what could it be. So what do I do? I called Chunk. He comes over and says....Ohhhh that opens **Nieghbors name** garage door. Of course I shoot him the evil look b/c I was completely serious about the whole thing and he mocks me. I guess we will never know!