I bought about 8 of these headphones for my class last year. Within a few weeks, two of them stopped working. Everyone stopped working during overtime. They weren't used that much either - only about 40 minutes a day multiple days a week. My students didn't move them around the room either, so I don't think the problems were caused by normal wear and tear. The volume controls are difficult for young children and I've played around with them a lot too with little success. These headphones were one of my most regretted purchases. I recommend paying a few euros more for another brand. It was a waste of money.
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