Seymour Duncan STC-2P preamp system for basses with passive(high impedance) pickups. Features 2-band active EQ with adjustable slap contour. Low noise discrete cicuitry provides a great amount of control over your sound. Allows for several custom control layouts, but is pre-wired for two pickup applications (blend, master volume, and stacked bass/treble controls). Includes preamp, high quality pots, custom black knurled knobs, jack, battery clip, and wiring schematic. Made in the USA.