Astell&Kern AK120 Mastering Quality Sound Portable Dual DAC Hi-Fi Audio System Dual Wolfson WM8740 DAC provides true Dual-Mono setup that gives better channel separation, broader dynamic range, and wider soundstage, USB & S-PDIF External DAC fucntion Mastering Quality Sound High-resolution digital audio playback up to 24bit/192kHz 64GB of Internal Flash Memory & Dual MicroSD card slots support up to 64GB in each slot 2.4" capacitive 16MM IPS touchscreen (320x240) 14 hours of continuous audio playback (FLAC 24bit/96kHz)