The UR28M from Steinberg is a USB 2.0, DSP-powered digital audio interface featuring 4 inputs and 6 outputs, designed to deliver high-resolution audio. Two of the inputs consist of D-Pre microphone preamps with switchable phantom power. Hi-Z instrument inputs are also available, along with S/PDIF I/O on RCA coaxial connectors. A stereo mini input jack allows for connecting a portable audio player or other devices for use as a reference source.