Medisystems manufactures a wide range of electronic nurse-call systems. These systems are modular and can be configured for establishments from very small nursing homes to large institutional hospitals. Extremely sturdy, the oldest installed are fully functional even after more than 20 years of continuous use. Based on a simple Red-Yellow-Green signaling principle, present models incorporate a host of additional features including emergency alarm alerts, instrument alarm relays, nurse presence registration, patient-nurse intercom, hospital wide code-blue alarms and call response monitoring. They comprehensively address every aspect of nurse-call and require no special training to understand or operate.