Shimano Boitier Connection Potence DI2 SM-EW90-A 5 Ports Black

The SM-EW90 DI2 stem connection box is the central point of all SHIMANO Di2 Dura-Ace and Ultegra drivetrains. This is where gearshift orders are placed. This box has a battery charge indicator and five ports allowing the simultaneous use of gear change controls at the level of the handlebars and the extensions.