I took the child, and he began to use it when jogging. They hold very well, do not fall off the head at any distance, do not interfere because there are no wires. Charging with a half-hour daily run is enough for a couple of weeks. That is, the issue of energy saving does not bother at all. They also charge quickly. But to engage in the gym (barbells, dumbbells) with them is inconvenient, too large, although some somehow manage to. There is one feature associated, probably, with energy saving - the sound, even with the shortest pauses, turns off, then turns on again. It is well audible when listening to something in silence and is quite annoying. When running, where the flow of music is constant and, in general, you are not up to the smallest detail, such a flaw is not observed) so if someone is looking for headphones for sports, then I recommend this particular model. Although I myself would never have thought that such a form factor would be convenient
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