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SHIMANO DI2 SM-JC40 JUNCTION B BOXShimano's Di2 electronic drivetrain is a little more complicated than a mechanical drivetrain. Instead of having cables and housing, it uses wires, batteries, and junction boxes to control the entire setup. The Shimano Di2 SM-JC40 Junction B Box can be viewed as the brains of the operation. All of the wires and battery plug into the junction box.FeaturesDesigned for external frame wire routingManufacturer's part number: ISMJC40 | Shimano Di2 SM-Jc40 Junction B Box External Frame E-Tube Junction Box B

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