This circuit offers the standard Jazz Bass controls, plus the option for series wiring between the front and rear pickups. The control plate is not included. This circuit features a push-pull switch on 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 controlled by the front pickup's volume knob. The wiring uses cross wires. The capacitor is a vintage 70s-80s Tropical Fish capacitor, chosen for its aesthetic appeal, instead of the commonly used Orange Drop. (Component changes and upgrades are available for an additional fee; please comment if you have any requests.) ※Regarding installation: This is a completed circuit, so you just need to solder the pickup +/- wires and the string ground wire (connected to the bridge). Detailed wiring instructions will be included with the product, so you can rest assured. This product is designed to ground through a metal control plate. If separate grounding is required, it can be provided 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 minor scratches from the manufacturing process and solder marks from testing, but these are newly made products, so please understand and be assured.