Features:

• 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 from http://e-tubeproject.shimano.com/
• All Di2 components on the bicycle require the same firmware version. Using Di2 components with different firmware versions may cause malfunctions