This is the Shimano DI2 Dura-Ace E-Tube Junction Box. This box is referred to as the junction Box A  and is located at the handlebars on a Di2 build. The box is available in either a three or five port option, to accommodate either a one pair or two pair shifter arrangement.

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

This product was added to our catalog on July 26, 2014