I want to warn those who want to buy these headphones online. I must say right away that this is my personal opinion and I am not going to argue with anyone. After listening, watching and reading advertising, I went to the Sony Centre. First of all, I was interested in "the best system of active noise reduction." I wonโt talk about how the store manager and I connected these headphones to my Sony phone for 20 minutes. So, the quiet conversation of managers with customers and the noise of the shopping complex is reduced by about 60-70 percent. That is, with the noise reduction system turned on, I hear the indistinct hum of people speaking quietly and the hum of the shopping complex, which personally irritates me even more than the normal conversation of people. If you turn on the music above the average level, then the noise is not heard, but "ordinary" headphones without active noise reduction also do this. I can't say enough good things about the sound either. For 2 years now I have been using bluetooth headphones from another well-known company and Chinese ones from Ali for 1500. And I answer that their sound is no worse than that of these Sony for 500 bucks. In general, a complete disappointment with Sony products. Bottom line: before you buy this miracle of technology, go listen to them in the store.