Doorbell

I have seen many kinds of doorbells, though i'm pretty sure that it's first time i see this one:

When i saw it first time, i immedietly thought of Jack White singing
"I'm thinkin' about my doorbell
When ya gonna ring it, when ya gonna ring it"

I need to get one of these and a head on the other side of the wall

haha, when i will move to a house i will certainly get something like that, it's really kewl