* EPS V4 Interface that can be inserted in any bar end or in the port of compatible frames* Clean, fully integrated appearance & hidden cable routing* The heart and brain of the system: it handles the communication between derailleur and shifters, system diagnostic, zero setting and ride setting.* Dual ANT+ and BlueTooth LE antennas allow communication with most GPS computers & smart phones* Synchro Shift option to enable automatic front shifting when reaching specific ratios* Easy access to charging port* IP67 waterproof rating * Cables not included. Requires specific cables for frame mounting and for handlebar mounting.