**********Prevent garbled phenomenon; use SWA DEVICE aeronautical communication special parts to ensure signal transmission stability*****Equipped with waterproof base, anti-temperature and humidity changes; emission Distance; 500m at open area*****Table Bells come with a base and double sided adhesive; it can be fixed on the table or walls for customer getting attendant by pressing a table button*****Suitable for restaurants; hotel conference room; executive dining rooms; Saloon; nightclubs; bowling alleys; massages house; church*****For Elderly/Patient/Disable/Children/Examiner/Priest/Doctor/Customer use; When someone wants server; they can presses the button of a service bell; which sends a signal to the central receiver