• 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
• Weight: 33g (including cables)
