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Excellent voice and sound quality instructions are very easy to understand even with strong background sounds and over long distances. In addition the trainer protects his voice Simultaneous talk thanks to full-duplex. No frequency overlap even with simultaneous use of the system through multiple groups Ideal aid for sports schools. Perfect training support for 2 to 6 people High battery performance. Up to 10 hours talk time and up to 3 days stand-by time. International products have separate terms are sold from abroad and may differ from local products including fit age ratings and language of product labeling or instructions.