The Proel Tube Microphone Preamp with USB includes a range of accessories and useful tools designed to complement audio systems for stage applications, recording studios and fixed installations. Hosted in a stylish extruded and stackable aluminum chassis, the 100 Series products offer quality, versatility and reliability in an affordable package. FeaturesTube microphone preamp with USB12AX7 tube preamp section for adding warmth to microphones and instrumentsBuilt-in low-noise +48V phantom powerPhase reverse switch, adjustable LO-CUT filter, VOCAL EQ, built-in LIMITER circuitInput and output GAIN controls plus SATURATION functionAccurate dual LEVEL METERMicrophone (XLR-F) and instrument (1/4" JACK) inputsXLR-M and 1/4" JACK balanced outputsSpecificationsInputs: Microphone (XLR-F) and instrument (1/4" JACK)Outputs: XLR-M and 1/4" JACK balancedCompatible Operating System: Windows XP/Vista/7 and Mac OS 9.1 and newer