Spec Sheet Preview: The Alpha Communications® / Cornell A-4000 Audible Visual Nurse Call Annunciator/Control Panel provides for audible and visual call indication without the use of voice intercom communications. A basic nurse-call system may consist of an A-4000 series annunciator/control panel, room call stations, emergency call stations, dome lights, zone lights, control unit and power supply equipment. EMERGENCY calls take precedence over ROUTINE calls. Call signals can be canceled at point of origin only. Indicator LEDs signal the presence of EMERGENCY and/ or R …