... host. The host has two display windows. First one is queue number, second one is tablenumber. When press the requester, the number ... be displayed on the second window,when there are more than one calling, then the waiting quantity will displayedon the first window ... : 1-key button, 2-key button, 3-key button (choose one or more)4) Signal enhancer (optional) 5) Button stand (optional ...