The Rolls MP13 Mini Microphone Preamp is a single-channel microphone preamp that is designed to provide a small, simple, and inexpensive solution for a variety of applications. The unit has both XLR and 1/4" inputs and outputs, and a single gain control with a clip indicator. Phantom powering (+36V) is included for use with a condenser microphone. The 1/4" output is specially designed for use as either a mono unbalanced output, or a stereo headphone output.