Shimano SM-EW90-A 3 Port Di2 Junction Box is the versatile meeting point between the shifters and the rest of the Di2 Groupset.
This junction box is required to connect the shifters via E-tube wires to the down tube junction wire.
Battery level indicator feature
Additional charging point when using internal battery
Gear index setup switch to allow fine tuning via shifter buttons
Reliable and secure water resistant connectors
Stem mounting strap included
E-tube EW-SD50 wires not included