... in restaurant ,KTV, hotel , coffe house and so on.Wireless call button , 10colours for your choice. 1 key ,3key. Water ... hospitals, tea house, coffee shops, health clubs, beauty salon, spa center, bars, swimming pool, beach, etcWhat are the components of the ... calling system?1. Wireless receiver, installed on the count 2. Call button, installed on each table3. Signal repeater (optional), enhance the ...