... call the nurse ,waiter ...save your cost ,inprove the satisfation !!! Y-40A wireless call system 1.Combination: receiver /host+call button/transmitter ... press the button and the message will sent to Y-40A ,then the Y-40A will show which table NO.Say,if you on ... for guset for service ,inprove satisfation of guest ) 4. Feature:Y-40A:1.Numeral coding technology ,with steady funciton, long distance wireless ...