The room module with call and presence button is the compact central control unit for patient and resident rooms. It is equipped with one red and one green button. The red button is used to trigger calls and contains a red LED as a location/reassurance light. The green button is used to indicate presence and as a switch-off button. The operating elements of a room, such as the call button on the bed, are connected via the room module. A room signal light can be connected to the room module to ensure optical call signalling in the hallway.