Spec Sheet Preview: The Alpha Communications® / TekTone® NC110A Audible Visual Nurse Call Annunciator/Control Master provides for audible and visual call indication without the use of intercom communications. A basic nurse-call system may consist of an NC110A annunciator/control master, room call stations, emergency call stations, dome lights, zone lights, control unit and power supply equipment. Emergency signals are identified at the annunciator/control panel by a rapid flashing of the associated station indicator LED, call LED and emergency LED; in addition&nbs …