Shimano Di2 EW-JC302 2 Port Junction For EW-SD300

A simple 2-port junction that connects two Di2 e-Tube SD300 wires, extending their length without compromising power or data transfer. Ensure all Di2 components share the same firmware version to prevent malfunctions. Update firmware using the Di2 system checker at https://e-tubeproject.shimano.com/.