... calling number will be showed on the screen when calling Main functions: MY-D LED screen 1) Usually install in corridor, ... side display;2) Sickbed number will be displayed on the screen when a patient is calling. And will blink;3) ... Date, month, day, time will be displayed on the screen if there is not call; Production Specification:Working VoltageDC18VWorking Current450mARemindRingingEnviroment ...