Seymour Duncan Basslines AJJ-1 Pro Active pickup set for Jazz Bass®. The Pro Active pickup system is designed to provide the cleanest possible signal with expanded headroom and dynamic range. A specifically wound low impedance coil is coupled with a small but efficient preamp built right into the pickup. The resulting sound is brilliant, responsive, and dead quiet. It's also more open, warmer, and more musical than standard active pickups. The gain is matched to the levels found in passive pickups. This is a plus for musicians who switch between active and passive instruments on stage. Wiring schematic, mounting screws, pots, 9V battery clip, output jack are included. Made in the USA.