The brain of the system, the EPS Power Unit is much more than just a battery. Its housing contains all the electronics of the EPS drivetrain, the system memory input/output gates & the battery charger plug. The V3 version of the internal power unit maintains all of the previous characteristics & technologies that derive from the V2; such as a vibration absorbing outer material, ultrasonic seals providing a waterproof construction & industry leading autonomy, & houses them all in a slimmer, more versatile package. This V3 design opens up the possibilities for internal mounting not only in the most aerodynamic framesets with very slim tube designs but also gives a greater deal of flexibility with regards to placement within the frameset. Thanks to this new slim structure the EPS advantage is now available for all frames, no matter which make or model you choose. Compatible with: Campagnolo Super Record EPS 2015 onwards & Record EPS 2015 onwards electronic group sets. Chorus EPS retains the V2 EPS interface.