This Shimano E-Tube Di2 Complete Wire/Power Kit is a complete kit and contains all the necessary pieces to hook up your Ultegra 6770 and Dura-Ace 9070 Di2 electronic components. You'll get five wire sections -- front wire harness, downtube, front derailleur, rear derailleur, and battery. The front wire harness has an integrated A junction, but the B junction is a separate unit. You'll get that as well. The kit also includes a battery and battery mount along with a charger and cable.
We have the E-Tube Di2 Complete Wire/Power Kit in a number of wire length options to fit differently sized frames. You can also choose between internal or external. For bikes designed to accept it, the Internal kit will route the wires and B Junction inside the frame tubes. Conversely, the External kit routes all the wires on the outside of the frame tubes, and the B Junction is fastened to the cable guide underneath the bottom bracket shell.