The section on latency really needs to be elaborated on. What dongle are users supposed to use? I bought these and it seems as though the claimed 20ms latency needs LE audio/LC3 codec, and RTINGS seems to agree with this. AptX adaptive has a noticeable latency closer to 100ms. Did Sennheiser say what dongle to use? Their own BTD600 does not support LC3, and the only LC3 capable dongle on Amazon seems very sketchy.
mine have failed twice now with battery issues and defective electrical components / module, I won't be purchasing Sennheiser's poor quality (deletted by moderation) rubbish again.