4 ” B/W 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, image capturing and storing automatically,