Shimano Di2 EWSD-50 Electric Wire; - Waterproof cable for Shimano Di2 shifting components. - It connects the Di2 components with the junction box SM-JC40 or SM-JC41. - Easy plug and play system to connect the cables, which are available in different lengths to accommodate most frame dimensions. - Connection with PC for diagnosis and changing the shifting order. - Fits all Di2 components, incl. battery except the Dura Ace 7970.