Note: This article only refers to the older REAL BLUE (2020) and REAL BLUE NC (2020) models. How can I tell which version of the REAL BLUE/BLUE NC I have? To the FAQ
The older models of the REAL BLUE (2020)/BLUE NC (2020) do not support apt-X. The new versions REAL BLUE/BLUE NC, on the other hand, have aptX and AAC support.