The EF-204 Master station unit includes the power supply for all the intercom components in the system. In the case of shortcircuit on any point of the line, the unit shuts down with an instantaneous recovery after the fix is cleared. System can drive up to 60 single channel beltpacks or 20 desk stations.

Separated four channels are provided with independent Talk, Listen, and Call signalling buttons. Linking between channels is made easy from the front panel buttons.

All the components in the system incorporates digital control to implement different task as Mic Kill, remote buzzer switch-off, latch or PTT mic switching, etc.