... guest to call waiter by just pressing a button. LED receivrt How to work of this system,1. Put ... operation, needn't install. Just set the transmitter calling number into the receiver. 3. When the customer need service, ... calling bell.2, 5-60 seconds optional for call number loop time, or no loop3, 5-90 seconds ... the table or hung on the wall. GDH500 LED waiter calling system for restaurant, cafe, hotel