The GT-2HB is an audio/video hands free tenant sub master for use with the GT-2C masters. The GT-2HB is black but is also available in white (GT-2H) and stainless (GT-2HS). Up to three GT-2H sub masters can be connected to each GT-2C master in the system. The GT-2C is used to view and communicate with the visitor at a GT entrance panel. This master will support three GT-2HB sub masters with the ability to communicate internally between the master and sub masters. The unit features a 3.5" color TFT monitor, PTZ control button for the camera, and picture memory to record visitor images automatically when a call is placed. A tenant video door station may be added to replace peephole identification. Up to 500 stations can be used in a system.