Westminster Effects Wittenberg Bass Preamp V2; all analog bass preamp, suitable for active and passive pickups, 3-band EQ, controls for Gain, Volume, Bass, Middle, Treble, Midrange-Switch, Pickups-Switch, 6.3 mm mono in / output jacks, XLR out, bypass footswitch, status LED, power supply via optional 9V DC adapter (409939), 2.1 mm x 5.5 mm barrel plug, polarity (-) center, battery operation not supported, current draw 16 mA, dimensions (L x W x H) 12.2 x 6.6 x 3.6 cm / 4.8" x 2.6" x 1.4", weight 283 g, handwired in South Carolina, USA