4 ” color video doorphone ,calling. talking.monitoring,hands free talking,wall mounted installation,LCD display,calendar function, Can show characters in english.complicated chinese.german.russia .french.japan...and so on ,15 wireless zones,set 6 groups of alarming telephone numbers,record personalized voice,alarming with prerecorded voice,monitoring on spot,arming/disarming by remote controller.keypad.wireless keypad.long distance callling.