... the calling number by the button on the screen.6.Call service -- in Hotel,Motel,Restaurant,Dining hall ,KTV,SPA,GYM,Coffee ... including call-button. 2.Calling numbers display panel,located at the staff area,including built in audio sound (chime) with optional external speaker ... . Can be either wall,ceiling, or desktop mounted. 3.The customer calls the waiter by pressing the call button ...