Glensound GS-FW028 - 12 Circuit Desktop Four Wire Base StationA large four wire base station for 12 circuits. Each circuit has its own talk button, return level control, and incoming audio present LED so that you can identify the incoming audio source. There is also a programme input with level control for the GS FW028 speaker or headphones. Features: 12 independent 4 wire circuits with interrupt (IFB standing inputs) Individual talk switches Talk to all switch Talk switches momentary or latch Programme input