On android with bluetooth 4. X, headphones work fine, transmitting sound in good quality (youtube, music) simultaneously with a microphone (calls to discord/telegram/phone). Those. the headset is 100% working and does not require bluetooth 5. X, but it all depends on the device / system. On Debian, Ubuntu/Xubuntu, the same problems with the microphone, although you can select a profile there. While I blame the Chinese bluetooth adapter in the PC. I will try the adapter from the manufacturer. Maybe I'll ate my review after testing.
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