Video Doorphone 7" TFT Monitor intercom system 4-wire Connection Handfree Communication ... +2monitors2camera+3monitors Advantage: l Audio and video transmission, unlock and hand-free user friendly designl 7 inch TFT color display screen, clear vision and ... , multi-departments or villas,appartments Why to choosel The Model Video Doorphone, large screen, provides a beautiful vision and safe feeling with ...