Featuring the new Shimano D-Fly Data Management system. This new wireless component adds another dimension to the Di2 experience by wirelessly connecting riders to their Di2 data through a cycling computer.
Larger clearer screen which can display more info and very useful to be able to swipe to change screens.
I purchased the base unit and later a premium heart rate monitor strap.
One word of warning, check the circumference of the strap as its not adjustable like the old style and unless you are a stick insect it will be tight."