Universal Radio-Interface for the connection of wireless radio systems to wired intercom systems (4-wire); 19"/2RU; integrated power supply and fans; programmable HF-transmission power; DSP functions for audio processing; repeater function; this model can be operated in semi-duplex or 2-channel simplex mode; this "dual" version can be equipped with two mobiles radios of Motorola DM4000 Series; Radios sold separately.