The call and switch-off button features a red and a 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. In addition to the red location light, the green button features a green presence lamp. This call button has an ancillary plug contact (RJ45 socket) so that it can accommodate movable call devices at the patient's bed.