Shimano 105 FD-R7150 Di2 Front Derailleur - 2x, For 2x12-Speed, Braze-On, Down-Swing, BlackThe Shimano 105 FD R7150 Di2 front derailleur provides precise, coordinated front shifting. Features full and semi synchronized shifting functions that can be selected using the E TUBE app. Product Details: Digitally accurate electronic shifts and coordinated communication between shifter and derailleur Powerful, accurate, smooth front shifting with the programmed chain guide control by automatic trim Shift from the big to small chainrings, or vice