There’s too many problems. I believe it is a returned product with a defect already used by someone. Across the entire frequency range these sound quite natural to me - not something I can say of the $300 headphones Ive tried. Could wear for house and hardly notice they are on your head. I purchased a quality cable - and plugged them together. Ive bought two batteries and rotate them, charging one while using the other, but thats kind-of irritating. The box was plain. About 2-3 days later after only wearing these about 1 hour a day, and all the padding was compressed and I was pretty much walking on the bottom of the shoe. I have one closet in my entire apartment. Die Kopfhörer sind auch eindeutig benannt und nicht verschlüsselt als Nummer.