These headphones are unsuitable for sports because they become slippery due to sweat and fall out to the ears, even with the earpieces on. In addition, the charger -- dongle -- is extremely impractical. It's a mystery to me why a normal USB connection wouldn't suffice. The ear elastics also fall off all the time, which makes the headphones unusable. It's a shame really, as the sound is quite good. After the loss of the ear elastics and now also the charging cable/device/dongle, these headphones are going in the trash after a long time of annoyance. Expensive and unusable, unfortunately.