Here are the specs.. Controls Volume Mid Tone Control / Pickup Balance with center detents Treble / Bass Tone Controls with center detents LED Battery Meter Output Jack Features True organic sound with superb string touch response. Active Balance system expands the useful pickup mixing combinations. Active Tone controls have a flat frequency response in the center detents and support both subtle and more extreme sculpting. Supports all types of pickups and includes independent 0-10 dB gain adjustments for mixed pickup configurations. LED Battery Meter informs you of your batteries charge condition. Easy to install in a standard Jazz Bass body with simple hand tools - no wood modifications or battery box needed. Battery box is not required but can be used if present. We designed our unique electronic circuits using high quality industrial components. We build our surface mount circuit boards in house and assemble the preamps in South Beach, Oregon, USA. Has a Q-parts knob as I can seem to locate the original. Works perfectly. Will ship USPS priority CONUS only.. No original packaging but will be shipped securely.. Thanks TB!