Shimano Di2 Junction Box - 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 - Internal Battery charging port - Includes Junction Box Band (CY9082) and Junction Box Hook (Mounting Plate, CY9081)