2 PORTS JUNCTION, EW-JC302, SD300 PORT X 2

- Shimano Di2 Frame Junction Box

- Connects via SD-300 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

- Number of Ports: 2