Sony Walkman F Series 64gb Black Nw-f887(japan Import) It supports high-resolution audio source that exceeds the sound quality of the CD Walkman for the first time in history Full digital amplifier which evolved by the "S-Master HX", playing the high-resolution audio sound source It is equipped with up-converts the sound quality of the CD or more compressed sound source "DSEE HX" In one operation, to achieve the recommended sound settings "ClearAudio +" Android 4.1