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Mix-minus Technology 1~89 Delegate units can be used in one same group category 1~99 Group setting, 4 Grouping at the same room 0~30 Steps microphone sensitivity 3~40min or Free time of the microphone NO Automatic power off control follows the master unit LCD & back lighting display Battery & Signal Indicator Voting, Speaker volume buttons Built-in Speaker, 3.5mm Stereo headphone out 48~60 hours system ON with one full charged battery approximately
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