Shimano Dura Ace SM-EW90-A Di2 3 Port Junction Box (A)

-All Di2 components on the bicycle require the same firmware version. Using Di2 components with different firmware versions may cause malfunctions -Use Di2 system checker to update component firmware from http://e-tubeproject.shimano.com/ -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 -OEM front wiring kit for Dura-Ace Di2 9070 -LED battery charge level indicator -Rear Derailleur adjustment mode