,never usedActive Preamp 3 Band Equalizer EQ Harness Guitar Tone Control System-IIIfive individual potentiometersFour of them: Middle,Treble,Volume & guitar tone controls for active pickups/midrange/treble,master volume Material: ABScolor: As shownInput Impedance: 20MOhmFrequency Response: 20Hz~20KHz: +/-12dB at 85Hz Middle: +/-12dB at 800Hz Treble: +/-12dB at 7KHz Output jack 9V battery not included Applications: Electric guitar, and piezo equipped instrumentswiring diagram is included Package Includes: 1* pickup main part5* potentiometer gasket5* potentiometer nut1* socket gasket1* socket nut1* battery box2* screwsOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.