Bluetooth uses the 2.4GHz spectrum by the way
It employs UHF radio waves in the ISM bands, from 2.402 GHz to 2.48 GHz.
https://en.wikipedia.org/wiki/Bluetooth?wprov=sfla1
But I know what you mean, those headsets with a separate dongle work good enough. Shame really, that Bluetooth hasn't caught up by now, except some barely supported low-latency codecs