I don't know much about headphone design but these were the weirdest. One side of the earpiece is deliberately shorter than the other. I don't know the purpose and don't really want to bother with it but I wanted a cheap pair of Sennheisers with this design at my mother's request but when she got it she stumbled on the design just like me. The sound quality was quite comfortable, if not better than the Sennheiser in-ear headphones I own, but it does the job of the design, albeit an earpiece shorter. Maybe someone knows what that means, but I can't give it more than 2 stars.
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