RME Audio Interface (BABYFACEPRO) Efficient design - Baby face pros incredibly efficient design almost never requires an external power supply  its perfectly stable on USB 3 bus power, and also most USB 2 ports, with no degradation in any technical specifications. This makes it perfect for mobile recording, even with a pair of your favorite condenser microphones. The comprehensive feature set continues with an optical Toslink I/O; use as either an ADAT port with smux support or SPDIF for sessions up to 192 kHz