The RME PSU is a power supply for various RME interfaces. It is a european format power supply (100 - 240V, 50/60 Hz, 0.5A) and can fit multiple socket types.
The RME PSU is for use with Multiface, Multiface II, Digiface, HDSP RPM, ADI-2, ADI-4DD, QuadMic, OctaMic/OctaMic D and Fireface 400.