To be honest, I just bought them, the experience of using them is 2-3 hours. I really liked the sound: fat b, high frequencies in place (they promised two speakers, it seems that they are). I don’t know how long they work (2 hours without a case will suit me), I haven’t used them as a headset and I don’t worry about this. They stay well in the ears. I'm pleased with the purchase.
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