Shimano's EW-WU111B D-Fly wireless unit connects inline to a Di2 E-TUBE system enabling the use and connectivity of ANT+ and Bluetooth LE compatible accessories. It also allows the use of SHIMANO's smartphone and tablet E-TUBE PROJECT software for maintenance and system update FEATURES: 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