Shimano XTR SC-M9051 Di2 Digital Display Unit, Junction Box with 3 E-Tub - The Di2 System Information Display Unit serves as a display, charging port, and wireless communication connector for E-TUBE compatible DI2 systems.ANT and Bluetooth LE TechnologyCompatible with Shimano charger SM-BCR2D-Fly compatibleE-TUBE settings can be managed with smart phone/tabletHandlebar Mount