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. The control plate is not included. This circuit has a push-pull switch added to the tone control. When pushed, it functions with normal controls, and when pulled, it is wired in series. In series mode, the volume is adjusted with the front pickup's volume control. Cross wires are used for the wiring. The capacitor is a beautiful vintage tropical fish from the 70s-80s, instead of the standard orange drop used in custom builds. (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 also be included with the product, so please rest assured. This product is designed to be grounded through a metal control plate. If separate grounding is required, it can be accommodated for an additional 500 yen, so please comment before purchasing. The photos are for illustrative purposes, but this is a listing for a circuit with the same specifications. 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 products, so please understand and be assured. #UsagiWorks