RME QuadMic II, 4-Channel Class-A Micpreamp, switchable per Channel: 48V Phantom Power; Lo-cut Filter and Phase Reverse, Signal- and Clip-LED per Channel, Connections: 4x Mic/Line-Input XLR/TR 1/4" Combo Input, 4x Line-Out 1/4" TR, incl. Power Supply, optional Battery operating, Housing: 9.5" 1 U