The core v2 garbage, I personally experienced, Tmall customer service is even more garbage, trying to scare people. I bought Core v 1 for half a month, and the thread inside was broken. After listening to the good sound quality, I bought a pair of v2 cables with my friends. If you can't hear it for two months and can't touch it immediately, there will be a sound. You know, no matter how powerful a product is and its after-sales quality is not good, it is useless. Who can fix it with a headset? A new line broke down in January, and the after-sales service was even more rubbish ... who tells lies and thunders every day? I have experienced it personally. The quality is poor, the workmanship is poor, and it is very easy to break down. I'm not black. Tmall customer service threatened me and I was very angry.