Shimano EW-JC200 Junction (2 port) E-Tube Wire Connector

Shimano EW-JC200 Junction (2 port) E-Tube Wire Connector 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.