Sony NWZ-E464K E464 8GB MP3 Player and Active Speaker Bundle NWZE464KB Blue 2 screen, Alarm and sleep timer function, FM tuner, voice recording, 3 clear sound technology (Clear Bass, Clear Stereo, DSEE) Long attery life up to 50 hours of music or 10 hours of video playback when not docked Battery life up to 15 hours of music or 3 hours of video playback when docked