Campagnolo EPS (Athena) Power Unit - The digital brain of the EPS Athena drivetrain - it monitors the battery, transmits and receives signals to and from the interface, and controls and monitors the function of the derailleurs. The unit also checks for system faults, warning the user when necessary via an RGB LED and a buzzer. - Its housing contains all the electronics of the EPS(TM) drivetrain, the system memory input/output gates and the battery charger plug. - Ultrasonically welded casing for full waterproofness. It is also made of a vibration absorbent material with specially contoured interior for maximum protection of the battery and electronic components against vibration even on very poor road surfaces. - Weight: 167 grams Campagnolo EPS Battery Charger Kit - EPS battery charger compatible with: - 110-220V voltage and 50-60 Hz frequencies - 12V voltage for charging in a vehicle (optional cable) Please note: Power Cable not Included but required to Charge the EPS Power Unit.