Shimano's Dura-Ace Di2 takes shifting to the next level. The Front Wiring Kit connects to both the left and right shifters and includes the Junction Box A (which displays battery power and allows manual adjusting). It's for use without the Flight Deck Computer.
The Front Wiring Kit is the wiring that runs from the shifters to the stem/bar junction.
Shimano Dura-Ace Di2 components are for use only with other Dura-Ace Di2 components.
Battery sold separately.
Weight: 22 grams