It got broken as soon as it was used (it could not be used for a day). Once I pulled out the cable at the time of wearing it off, I pulled the L (left) side without extending the extended part and broke at the base. The extension part was too hard to extend. The broken part is thin and weak, and it is a mechanism that can rotate back and forth about 30 degrees as a fulcrum. Even though the overall appearance is solid. Whether the other side is also weak, if you twist to try it will bend without breaking · · · feeling soft. Is the material different on the left and right? Either way it will break even if it is not much power. Earpower is heavy and it is too tight Such design can not be done? I think. I have experienced many times that I stepped on the cord and pulled in other things, but it was my first time of cracking.