SHIMANO - Junction A - E-TUBE - Under Stem Mount - 5-Port
SHIMANO's SM-EW90-B 5-port Junction A mounts neatly to the bike stem and connects with E-TUBE wires from DI2 shifters, accessory shifters, and the downtube junction wire. The SM-EW90 junction box features an integrated battery level indicator, charging port, and gear index setup switch.