The customer comes into the hall then press buttons or touch the screen on ticket dispenser get the ticket,

The ticket show the customer's queuing number and his service item,then both display(main display and counter display can show next number) and sound  box(can broadcast the next number to be served) tell the customer to be served.

When the operator press the manipulator,Sound Box can broadcast next queuing customer meanwhile show the next queuing number on the main display.So circularly do.

everything can set down by you need