The RME QuadMic II is a 4 channel microphone pre-amp. It features a simple and intuitive, no frills design, featuring 4 x XLR/TRS inputs, and 4 x TRS outputs on the back panel. Individual phantom power and gain pots on the front, along with LED lights for clipping, signal present and phantom power on. There are also phase invert and lo cut filter buttons per-channel too. The RME QuadMic II has excellent an signal to noise ratio, and very low harmonic distortion for crystal clean pristine recording. An added bonus of the RME QuadMic II, is that it can be powered by voltages from 9 - 18V DC, making it possible to power the device via batteries.