Shimano SM-JC41 Di2 Internal Junction B Box 4 Port

-Frame Junction Box connects via SD50 E-tube wires to four different points: front derailleur, rear derailleur, cockpit junction box and battery mount -All Di2 components on the bicycle require the same firmware version. Using Di2 components with different firmware versions may cause malfunctions -Use Di2 system checker to update component firmware from http://e-tubeproject.shimano.com/