... and voice, beautiful design We have been working on video door phone and video intercom for 6 years, we are marketing:1, 4 wire ... 1, Audio/video communication, 3.5'' TFT LCD color display;2, Intercom, inspection and Remote unlock;3, Support extended phone set;4, ... Inter-call with extended phone set;5, Support two camera for 7435 NCX;6, Optional for memory inside.Data ...