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Excellent voice and sound quality instructions are very easy to understand even in strong background noises and over long distances. In addition the trainer protects his voice. Simultaneous talk through full duplex. No frequency overlapping even when the system is used by multiple groups Ideal aid for sports schools. Perfect training support for 2 to 6 people. Reliable and safe interference-free Bluetooth connection over a distance of up to 500 meters regardless of smartphone or mobile network High battery power. Up to 10 hours talk time and up to 3 days stand-by time.