Shimano's SM-EWWU111A D-Fly wireless transmitter connects riders to their Di2 data to monitor Di2 gear position, battery life, as well as some other common rider data functions.

• Compatible with Shimano Road Di2 systems
• Compatible with Garmin Edge 1000 and PRO SCIO ANT+ cycling computer
• Powered by Di2 shifting system battery
• Dimensions: 38mm x 25mm x 12.5mm
• Weight: 5g
• Firmware updates available through Shimano's E-Tube Project app