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Shimano has simplified and improved the front junction box (junction A) for 9070 Dura Ace Di2. The new 9070 unit utilizes a rubber strap that cleanly and aerodynamically fastens underneath the stem. The 3-port 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 Dura Ace Di2 Junction-A Box
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