This idea of simplicity, along with flawless performance, was the primary driver behind Shimano’s new FRONT SHIFT NEXT Di2 function, which utilizes a single switch button to shift the front chainring to whatever ring it is not currently using. If you're pedaling in the big chainring, just hit the switch, and your front derailleur will drop the chain down to the little ring. Then, hit the same button again, and it'll shift it up to the big chainring again. Easy, right?
The result is a more intuitive shifting for less-experienced riders and quicker decision-making for veteran riders in the heat of competition.