Shimano Di2 Junction-A Box

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

• 3-port junction box
• E-tube compatible
• Battery charging port for use with Shimano ISMBCR2 charger
• Shimano part# ISMEW90A