Overall extremely pleased with the product and will repurchase when these bottles run out. Dog chewed the first pair that I loved. I bought these as workout headphones. I broke a component on that one, but it was time to upgrade anyway. Definitv keine gewohnte Sennheiser Qualität mehr. It was different from the picture, but it still suited her purpose. The belt it comes with is very convenient. That said, the battery life is amazing and I love the sound. I would never buy again. These were humanly inaudible amounts, mostly at the lowest frequencies where it is the least audible anyway.