• The Discussion Main Control Unit DMS4038, handling power 400W, supporting up to 70 delegate and chairman speech units,could be extended to up to 250 units by connecting with extension unit .

• Circuitry output jacks enable to connect amplifier for sound reinforcement,effect I/O jacks enable connection of frequency shifter or other equipmentl.

• Monitoring volume control

• Easy access to speech with only one key touch.

• Feedback eliminator function. When microphone is turned on, the built-in loudspeaker closes automatically to avoid feedback.

• Function of limiting active delegate units quantity, and supporting several conference modes: Free mode, FIFO mode and Limit mode.

• Telephone coupler input interface enables long-distance teleconference by connecting telephone coupler.

• Chairman unit is free of speaking number limitation.

• Chairman unit has the priority to completely control conference sequence and can switch off or mute any speaking unit.

• The chairman unit is free to be connected in series to anywhere in the circuitry.

• T-shape cable serial mode is convenient for installation and maintenance. Cable with complete aluminum foil and network shield reduces electromagnetic interference to circuitry.