Front Derailleur (2x)
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.
Synchronized shift and MTB derailleurs
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.
Details & Specifications
E-Tube Port type:
XTR M9050 (MTB)