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Feature:* Button-type digital adjustable Volume (0dB/-3Db/-5 dB/-10 dB/-15 dB/OFF ); Base(+6dB/+2 dB/0dB/-2dB-6dB); Treble(+6 dB/+2 dB/0 dB/-2dB/-6dB).* Four conference modes: FIFO (first-in first-out mode); NORMAL (normal mode); FREE (free mode); APPLY (apply speaking).* It adopts limited number of spokesman function: adjustable speech units numbe..

Features:* Use together with the Standard Digital Conference System Controller to expand system capacity by connecting more units.* Each Extension Controller can connect 128 units after connecting to system.* Can cascade up to 32 pieces Extension Controller.* It passed the high voltage (3500V ) test when leaving factory to meet safety standard.* Me..

Feature：* Smart touch buttons, user-friendly operation, including Record, Play, Mode, Switch and Volume buttons.* Four conference modes: FIFO (first-in first-out mode), NORMAL (normal mode), FREE (free mode), APPLY (apply to speak).* Support limiting the number of spokesmen: the number of speaking units can be set to 1, 2, 4 and 6; the chairman uni..

Feature:* Smart touch buttons, user-friendly operation, including Record, Play, Mode, Switch and Volume buttons.* Four conference modes: FIFO (first-in first-out mode), NORMAL (normal mode), FREE (free mode), APPLY (apply to speak).* Support limiting the number of spokesmen: the number of speaking units can be set to 1, 2, 4 and 6; the chairman uni..