The EW-RS910 junction box replaces the more traditional below the stem junction SM-EW90. It is mounted either in the handlebar end or somewhere built into the frame.
The junction box has two E-tube ports to connect it to the rest of the system, a charging port and a button used to check battery status and change settings on the fly.
You could replace this junction with the mountain bike System Information Display (XT SC-M800 | XTR SC-M9051), if you wanted to. This Information Display functions as a Junction A with three e-Tube ports, a display and features Bluetooth/ANT+ connectivity.
Details & Specifications
|Shimano model number:||EW-RS910|
|E-Tube Port type:||SD50|
|Component series:||Non-series components NON (All)|
|Downloads:||DURA-ACE R9150 Dealer Manual|
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EW-RS910 User Manual