 Customized master control station for Talkback system.  Used for 2-way full duplex communication  8 to 96 zone expandable system  Simple to connect fire fighter jack and hand set  Pick and talk facility  Front LED or LCD display for jack location display  16 swg CRCA sheet Housing  AC and DC meter to measure supply (Optional)  Inbuilt battery charger and battery space  Cleared front glass for more visibility