A tiny electronic component that performs an extremely important job. It is also used to sets the initial configuration & adjust drivetrain settings during a race, as well as displaying battery level.A vital component for the electronic drivetrain, it may be installed on the handlebar mount or on the brake cables.ANALOGUE-DIGITAL SIGNAL CONVERSION: Transforms the analogue signals received from the controls into the digital signals transmitted to the Power Unit. ZERO SETTING & RIDING SETTING: Used to set the initial configuration of the components & make fine adjustments during a race.RGB LED: Visualises battery charge status.TWO POSSIBLE INTERFACE MOUNTING OPTIONS: The unique design of the interface lets the user choose whether to install it on the brake cable or on the handlebar mount.