Bought on 12/11/19 from an authorized seller Used until 12/21/19 very carefully. Used them for 5-6 days for 3-4 hours Sound over wires (USB, AUX) - excellent Bluetooth sound from PC is terrible If you connect to your phone via Bluetooth, it's great. On 12/21/19, while watching youtube, the right earpiece failed. Turning on / off the headset, turning on and off different sound modes, connecting / disconnecting headphones in all available ways - USB, AUX, Bluetooth - did not produce any results. Those. and with wired connections, only the left one worked. The right one did not work even after a while. But miraculously earned the next day. Conclusion: 1) The headphones are positioned, sold as a high quality wireless gaming headset, as the best Bluetooth headset 2) They can only be used and enjoyed with a wired connection via USB / AUX 3) The sound quality when connected wirelessly via Bluetooth to a PC is terrible. A question of price and quality. They cost 35 thousand, but in wireless mode they turn into a brick 4) How one earphone can be turned off in headphones for 35 thousand, how the sound quality in wireless mode can be worse than that of cheap Chinese headphones - I don’t understand. The most basic function - good sound quality over Bluetooth - does not work. And one earpiece either works or not. When using them, there will be a constant fear that one driver or both may fail at any time. 5) I'm not an expert in sound, but I don't understand how, when connected via Bluetooth to a PC, they only work in one sound mode. Understand which is impossible. I understand that the sound quality over Bluetooth is worse than over wires. But not so much! When you press the sound mode switch button when connected wirelessly, nothing happens, the modes do not change 6) Today I took it to the store, I wanted to get money. They said it had to be submitted for examination. But in the Federal Law "On Protection of Consumer Rights" there is no such condition. Technically complex goods can be handed over and receive money before the expiration of 15 days. In my case, this period has not passed.