Mobilepre usb is the preamp with a built-in audio interface that's designed for laptop recording such as field recording and sampling expeditions. it's completely bus-powered (of course, you can use it on the desktop as well). a total of three kinds of audio inputs and outputs provide maximum flexibility for any application--including two on-board microphone/instrument preamps and high-impedance instrument inputs ideal for connecting guitars and basses. and unlike many competitors, zero-latency direct monitoring provides you with a streamlined professional recording experience.