This is the Shimano Di2 SM-BCR1 Battery Charger for Di2 electronic shifting systems with a removable battery. Features: Di2 battery, battery charger, and power cable are universal between Dura-Ace and Ultegra Di2 systems Di2 Battery Charger (CY7972) does not include a power cable; must be purchased separately (CY7973) All Di2 components on the bicycle require the same firmware version. Using Di2 components with different firmware versions may cause malfunctions Use Di2 system checker to update component firmware from http://e-tubeproject.shimano.com/ Specifications: FD/Shifter Compatibility: Dura-Ace 7970 Di2 FD/Shifter Compatibility: Dura-Ace 9070 Di2 FD/Shifter Compatibility: Shimano Ultegra Di2