The Shimano Di2 SW-R600 Remote Climbing Shifter is compatible with Dura-Ace 9070, Ultegra 6770, and Ultegra 6870 Di2 Systems. It is not compatible with Dura-Ace 7970. It will not work alone as a primary shifting unit. The total length is 265mm and it features a built-in E-tube wire.
