Instant Alarm Signaling Device Self Contained Local Alarm and Flashing LED 2 Form C Relays Microprocessor Controlled Low Battery Indicator The NC-20 is designed as a signaling device for use as a self contained Home Nurse Call System. The GRI Model NC-20 will sound a local alarm and flash an LED indicator, should anyone press the supplied (GRI CB-20) Call Button. The GRI NC-20 is also equipped with a form C relay output connections for use with external signaling devices. DESCRIPTION: The GRI Home Nurse Call System uses a microprocessor to monitor the open loop momentary push button (Call Button), the reset/cancel button, the supply voltage and provides control for sounder, LED and relay outputs. The Nurse Call System is set to alarm the instant the Call button is depressed. The sounder will continue to sound until the reset/cancel button is depressed. Other features for the NC-20 would include an adjustable sounder volume, power/alarm LED indicator, low battery indicator and (2 form C relay) contacts for control of external devices. The C form relay contacts close 45 seconds after the alarm sounds. This allows for caregivers to respond and cancel before the external communication devices notify additional responders. (The external communication device is not supplied.)