The Reflector Plate is the most ubiquitous device used throughout the serial. This is a screen that acts much like a "view screen", or videophone, in more modern science fiction. It is used to communicate between two plates or it is used, most frequently, to view (and hear) any remote location. No cameras or microphones are apparently necessary to this second function and it appears to have no limits - viewing the Sacred City, areas of Atlantis and the upper world with no problems.