
Set up Front derailleur limits (two bolt derailleurs: 6770, 6780, 9070)
Read how to set up your two-adjustment-bolt Di2 Front derailleur (6870, 9070)
The XTR Di2 M9070 Down Swing Front Derailleur features a 25% increased power vs M9000, an optimized Di2 cage profile, improved gear tracking and reliable gear changes even under load. It is meant to be used with two chainrings. The FD-M9050 is the XTR triple front derailleur.
It also supports Shimano Synchronized Shift and computer-controlled auto trim.
Want to use MTB derailleurs and also synchronized shift? You need a display in order for synchronized shift to function.
The two displays I recommend are the SC-MT800 display and its more expensive XTR equivalent, the SC-M9051. Functionality-wise, they're exactly the same. It is just the casing that is different.
Read how to set up your two-adjustment-bolt Di2 Front derailleur (6870, 9070)