The MQS-51 is designed to provide a simple, compact and inexpensive microphone preamplification for a variety of applications. The unit has both XLR and 1/4" Inputs and Outputs, and a simgle Gain control with a Clip indicator. Phantom powering is included for the use with a condenser microphone. The 1/4" Output is specially designed for use aseither a mono balanced output, or a stereo headphone output.The unit comes with a power adaptor.