This product is currently out of stock but should be available again soon.
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Shimano has simplified and improved the front junction box (junction A) for Di2. The new Di2 unit utilizes a rubber strap that cleanly and aerodynamically fastens underneath the stem. The junction box has a charging port that makes it possible to charge both internal and external batteries without having to remove them from the bike.
Features of Di2 Junction-A Box
Shimano Dura-Ace 9070 Front Derailleur
Shimano Dura-Ace 9070 Front Derailleur Adapter
Shimano Dura-Ace 9070 Rear Derailleur
Shimano Dura-Ace Di2 ST-9071 TT Shifters
Shimano Dura-Ace FC-9000 Crankset
Shimano Dura-Ace SM-BB9000 Bottom Bracket