The call module forms part of the emergency set and can also be re-ordered individually to expand the system. Within the set, the call module forms the central unit to which all the signals are transferred. It is installed in the immediate vicinity of the room where the emergency set is installed, for example above the door on the outside of the toilet. A triggered call/emergency call is transmitted to the call module and the red signal light lights up. During installation, DIP switches allow a choice to be made between a flashing light and emergency sound or a continuous light and continuous sound. Light and sound are switched off via a separate switch-off button.