Shimano Di2 EW-RS910 E-Tube Frame/Bar Plug MountThis high-quality frame/bar plug mount is specifically designed for simple and effective charging and management of your Di2 groupset. Its Bluetooth-enabled design allows you to easily connect to your groupset using your smartphone to change shift models such as manual shift, synchronised shift 1 and synchronised shift 2. As an added bonus, its built-in LED lights will illuminate to indicate the mode you've selected by a green or red light system. Finally, this handy device features water-resistant connectors, so you can keep your Di2 running in peak performance in any weather conditions.Features: LED window for battery level indication LED window for the button Shift Mode selection RD Protection function Bluetooth connection for using with your smartphone/tablet Water resistant connectors Charging PortA 2-year warranty is offered with all Shimano products from Chain Reaction Cycles (3 years on Dura-Ace and XTR products).Buy Shimano Components from Chain Reaction Cycles, the World's Largest Online Bike Store.