A general question, not really related to Nordic, but...
I have seen several references to BT 4.0 headphones. I was under the impression that BT 4.0 didn't have a profile for audio streaming, and that the sustained data throughput was too low for audio. Am I wrong about this, or are the manufacturers of these products using dual-mode BT chipsets in Classic BT mode, but using the BT 4.0 label as a selling point?