So I think they can be erroneously marked at the factory, so beware and be ready to send them back if this is so. I did not evwn realize that was on here when I ordered it. I often go through 2 a year, so I thought Id get something more durable. They often fell out. Both sounded good, but not great, to me. Comfortable and pretty Birkenstock shoe. Headphone connected easily to my sound system. Ive received compliments each time I have worn them. It will pass, as all things do, it just takes paitence. La première utilisation est perturbante car même si quand on fait des longueurs le son ambiant nest pas nécessairement important, on est tout de même déstabilisé, les oreilles perdant leurs repères habituels.