This is a circuit for a Jazz Bass that allows for series wiring of the front and rear pickups, in addition to the normal controls. Comes with a control plate. This circuit has a push-pull switch added to the tone control. When pushed, it functions with the normal controls, and when pulled, the pickups are wired in series. In series mode, the volume is adjusted with the front pickup's volume control. Thick cross wires are used for the wiring. The capacitor is not the standard orange drop used in custom builds, but a beautiful vintage tropical fish capacitor from the 70s-80s. (Parts can be changed and upgraded for an additional fee, so please comment if you have any requests.) *Regarding installation:* This is a completed circuit, so all you need to do is solder the pickup +/- wires and the string ground wire connected to the bridge. Detailed wiring instructions will be included with the product, so please rest assured. The photos are reused, but this is a listing for a circuit with the same specifications. The control plate in the photo is also included. Various circuits can be made. Please inquire. We create circuit assemblies for guitars and basses. Special specifications based on various orders are also possible. There may be some minor scratches from the manufacturing process, and solder marks from the operational check, but these are newly made, so please understand and be assured.