The RME Digiface USB - 66 Channel 192 kHz USB Audio Interface. The latest Plug and Play technology guarantees a simple installation even for the inexperienced user. Numerous unique features as well as RMEs robust drivers enable a quick efficient and comfortable operation of the Digiface USB. Its small size weight and bus-powered operation make the Digiface USB extremely versatile and useful. It could even serve as simple headphone amp for mobile use.