It will start with a blinking green light, showing the text "The bill, please".
-> No need to furiously wave with your hands, to whistle or to shout for the distracted waiter.
-> You won't miss the waiter, when he looks into your direction.
Additionally, there's a stop watch running. Just in case.
Just enjoy and wait for your bill...
PS: Only 1 Ad, and right at the beginning.
Hopefully, that's fair.