Ultegra di2 Disc Brake Upgrade Kit Mini Groupset for upgrade from 8020 (mechanical) to electronic Package Content : Shifter / Brifter Shimano Di2 Hydraulic 11 Speed 8050 RD 8050 FD Battery BT DN 110 A (New Type) Junction A ( Built In Handlebar - New Type ) Junction B Di2 Cable set Charger Di2 The cheaper option to upgrade