Shimano SM-EWW01 Di2 Wireless Data Transmitter Compatible with: Dura-Ace 9070, Ultegra 6870 Di2 and Ultegra 6770 E-tube road shifting systems, and the Garmin Edge 1000 Kit includes (1) SM-EWW01, (1) Frame attachment strap Dimensions: L 38mm, W25mm, H12.5mm Wt: &lt;5grams DI2 E-Tube Wire needed to coonect to DI2 System. (Wire Sold Separately) ONLY COMPATIBLE WITH ISMBTR2A DI2 BATTERY