Works perfectly! Power source included. Looking to trade for Darkglass Pre. PM with offers. Gallien-Krueger PLEX Preamp Bass Guitar Pedal Features at a Glance: 4-band active EQ and Contour control for sound shaping Selectable voicing filters expand your tonal palette Compressor with variable ratio, threshold, and attack/release Chromatic tuner with large, easy-to-see LED display Boost with variable clipping and level switch for improving weak signals Aux input and phones output for jamming along with recordings and private practice XLR output with ground lift and pre/post selector for DI-ing your bass USB in/out for MIDI, direct recording, and re-amping Effects send and return for integrating your other processors Tech Specs Type:Bass Preamp/Tuner/Interface Form Factoredal Inputs:1 x 1/4" (instrument), 1 x 1/4" (return), 1 x 1/8" (aux in) Outputs:1 x 1/4" (out), 1 x 1/4" (send), 1 x 1/8" (headphones), 1 x XLR (direct out) Computer Connectivity:USB Micro-B (recording, MIDI In/Out) Power Source:9V DC power supply (included) Height:1.4" Width:5.3" Depth:5.6" Weight:1.5 lbs.