each only a short joy, then total failure.

Meanwhile, I have to return the second copy. The first held just half a battery charge and then said goodbye to nirvana. After all, the second copy held 3 battery charges and then here was final. Sudden failure of the system, even though the battery was not empty. Then nothing more, connecting the charger cable leading to momentary light of the charging lamp, then it goes out, instead of switching to white and the device is dead. As long as the unit worked, the sound of comfort was perfectly acceptable and expected good. But high could not be recommended. When I do sports, I would like to not have to worry about the technology. A pity really, especially with the high price and the reputation of the manufacturer yet.