Alesis IO2 Express | 2-Channel USB Recording Interface with 48V Phantom Power (24-bit / 48 kHz) Two-channel computer audio recording interface, comes complete with a copy of Steinberg Cubase LE digtal audio workstation (DAW) software. Record up to 24-bit, 48 kHz audio into virtually any software High-quality A/D and D/A converters, discrete-design preamps, 48V phantom power Inputs for microphones, line-level sources, and instruments including guitars USB bus powered - no external power supply needed