Product Detail Professional sound quality (up to 24-bit/48 kHz) Two simultaneous analog inputs and outputs Zero-latency monitoring Compact, rugged metal enclosure for maximum portability and durability Powered by USB (USB 1.1 connection, cable included) . The "Digidesign Mbox 2 Mini Portable USB-Powered Pro Tools LE Audio Workstation" is best product for you. We recommended Digidesign Mbox 2 Mini Portable USB-Powered Pro Tools LE Audio Workstation