Shimano SM-EWW01 Di2 Wireless Data Transmitter

Shimano's SM-EWW01 Di2 wireless unit is a compact wireless data transmitter that features their new D-Fly Data Management System. Compatible with Dura-Ace 9070, Ultegra 6870 Di2, and Ultegra 6770, the unit mounts on the rear triangle of your bicycle and easily plugs into the E-tube wiring system, seamlessly connecting Di2 equipped bikes to a compatible wireless cycle computer. This allows riders to monitor their gear position, battery life, and other common functions via the SCIO ANT+ cycling computer, as well as other computers.