Features: 1) Analogue audio transmission technology, traditional and stable 2) Leisure bus-mastering technology to realize 0 disturbance 3) Low power consumption technology, powered directly by master unit not by itself. 4) Hand-in-hand technology Descriptions: 1) Concentrated with speaker and voting functions 2) In combination with TS-0600M system master, can connect 128 conference units at most, and adding extension mode can connect 4096 conference units max. 3) Built-in panel speaker and headphone jack, with clear sound and controllable knob 4) Inserting headphone for auto-muting 5) Insertable high-dispersion microphone with speech circular red indicator light 6) Whistle controllable, automatically mute for built-in speaker when microphone is active to avoid voice-feedback 7) Main unit can approve or deny speaker\'\'s request 8) The numbers of main unit is unlimited 9) The main unit can stop the speaker\'\'s speech provisionally at any time of the conference and indicate the speakers for effective operation of the whole procedure 10) The main unit has the priority to fully control the conference order 11) With LCD, the main unit can view the operation information of interpretation machine, monitor its own language information, operation information and results of voting 12) The unit is passive and powered by the master. Input voltage is 24V, in the safe range 13) 2-meter 13-core wire, its material is aluminum foil with line shielding to greatly decrease the disturbance of strong electromagnetic wave 14) No limit for the connection position of main unit, can series-connected at any place of the channel 15) Headphone jack with controllable volume 16) Hand-in-hand cable series-connecting mode, easy to install and maintain