This perennial favorite features a tough injection-molded case with an easy access battery compartment, input trim control and advanced new electronics which provide longer battery life. Features include Volume, Bass, Middle, Treble and Brilliance sliders along with an AC adapter jack, phase switch and sub-bass trim control. This preamp can be utilized with a piezo or magnetic pickup.   Outboard pro eq pre-amp For use with piezo or magnetic pickup Ac adaptor jack socket Volume, bass, treble, and brilliance sliders Phase switch