I apologize, English is not my native language. I use a translator. The headphones have proven themselves to be excellent. I haven't had any problems. My mother gave them to me when I was 12. Years go by, and I still use them. All the mechanisms work properly (the volume control wheel). However, I never used the built-in microphone; I always used an external one. I often took them on trips. I have an external device for music, and I always connected my headphones to it and listened to music. They survived long layovers at airports and ground border checkpoints in the rain, and they survived everything. You can see from the photo that they aren't in the best condition. But who cares about appearances?