... one system support 35 tables wireless calling system,wireless service system,service button,table call,factory good price offer,one system support ... colors.We set "Red" to "Service" button, "Green" to "Drink" button, "Yellow" to "Bill" button.In this way,the waiter can know ... by waiter,waiter can press the button "Clear" on Calling Transmitter Button,or Center Service press the table number on Clear ...