Shimano SM-EW90A Dura-Ace E-Tube Di2 3-Port Cockpit Junction BoxFeatures: SM EW90 A: 3 Port Cockpit Junction Box connects 1 pair of Di2 shifters to the frame junction box via 3 SD50 E tube wires SM EW90 B: 5 Port Cockpit Junction Box connects up to 2 pairs of Di2 shifters to the frame junction box via 5 SD50 E tube wires OEM front wiring kit for Dura Ace Di2 9070 LED battery charge level indicator Rear Derailleur adjustment mode Internal Battery charging port Use Di2 system checker to update component firmware
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