After seeing and reading about this elevator in Rome I thought I should post mine, too. It works exactly the same as in Rome (it's perfectly written in the link). Only mine is a bit bigger, almost 100cm x 100cm. There's just one weird thing, though. It takes 22 seconds to get from 0 to 6. But when you call the elevator it takes more than 30 seconds for it to arrive. Where it spends those 8 seconds? I don't know.