The v-6000 can be connected to 60 microphone units, with three-way output. The extended unit can be connected to 120 microphone units. System with fifo mode and MI, M3 and M6 limit mode, can be used for vies to answer first, parallel output, the output of parallel and recording audio output interface with the background music volume and total volume output regulator, power amplifier, high bass regulator, built-in phone coupling input and output port, can be used to remote telephone meeting according to the principle of communication of telephone communication two-way voice signal into the input, output, in order to control the meeting between the intercom can set the phone into the novel and pull out the President on behalf of the unit casing design. The microphone ON/OFF is equipped with a high-fidelity capacitive voice head built into the non-noise light touch film switch with an extremely long life.