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Necessary whether you're fitted with either roar or time trial dual control and satellite switches, you'll need Shimano's Dura-Ace Di2 Rear Wiring Kit to get your kitty to purr.
The Dura-Ace Di2 Rear Wiring Kit includes three different harness lengths, where the smallest will fit on bikes from 36cm, the medium between 52-56cm and the larger up to 66cm and the rear kit refers to wiring needed from stem/bar junction to battery cradle and front/rear derailleurs.
Includes a black, downtube wire cover/channel (also available as extra or in white or grey for better color matching) , battery cradle with rear wire harness but battery sold separately (along with separate charger and power cord) and complete instructions.