USB bus powered (no external power supply needed). Includes USB cable and software CD. Compatible with Windows and Mac OS X. dimensions: 125 x 160 x 55 mm, discrete design preamps, MIDI in/out, line-level sources, inputs for microphones, balanced studio monitor and headphone outputs, 3-colour stereo level meter and lighted status indicators for visual monitoring, and instruments (including guitars), high-quality A/D and D/A converters, record up to 24bit/48kHz audio into virtually any software, 48V phantom power, weight: 380 gr.