As a customer, whenever you need something, press the button and in a moment, a staff member will be there to attend to your needs. No more frustration about finding the staff members or worrying about leaving the machine you are playing.
At some time or another, it has happened to all of us to wait for the staff to help us with the machine, give us change or wanting something to eat or drink but we do not want to leave our machine, "it's about to touch".
We look around, look to the left, look to the right, trying to recover visual contact with a staff member. There is no one around, you wait and wait. Finally, you see someone at a distance. He sees you, you see it or we want to believe it but it is not true and the waiter leaves, - or worse, the staff member knows that you need something, but he is not in the mood to walk there.
No more waiting, no more to the stupid sensation of waving your hands in the air without being seen, no more feeling of not being valued as a paying customer.