... restaurant service call for guest to call waiter by just pressing a button. LED receivrt How to ... the calling information, and then go to service for the calling customerFeatures of GDH5001, Compatible with ... time, or no loop3, 5-90 seconds optional for music time, or continuous playing4, Recipient Capacity ... no coming call, and 12/24 hour mode switch.7, Easy installation, simple operation, and self- ...