Japan only Hi-Res CD (MQA-CD x UHQCD) compilation featuring two discs--one with tracks in Hi-Res CD quality and the other with the same tracks in standard CD quality so that you can compare the sounds. Green color label coating. If you play Hi-Res CD on MQA-enabled hardware, you can listen to the hi-res quality sound based on the original master. *Hi-Res CD can also be played on regular CD players in UHQCD 44.1kHz/16bit resolution. However, MQA-enabled hardware/software is necessary to harness the full potential of this Hi-Res CD.