Alesis IO2 Audio/Midi Interface 24-bit, 48 kHz high-end A/D-D/A conversion thru USB - recording software included 2-XLR mic inputs with 48V phantom and 2-1/4" balanced line inputs that can accept guitar level signals MIDI Input/Output and 24-bit S/PDIF I/O for direct digital recording Dedicated four segment signal/clip LED meter on both channels USB powered with low power usage - no external AC power supply necessary