Shimano Di2 Frame Junction Box
FEATURES:
- 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