Shimano announced this week that it has cut the cord on its electronic shifting system. The company has introduced a new wireless device that will connect its Di2 groups, and this will sync with the new Shimano PRO computer via ANT+.
The Di2 Wireless Unit (Shimano product SM-EWW01) will be compatible with Dura-Ace 9070, Ultegra 6870 Di2 and Ultegra 6770 E-tube road shifting systems. This Di2 Wireless Unit is powered by the same Di2 battery that powers the Di2 shifting system.