1) SB port is compatible with Futaba S.BUS servos and FrSky SBUS&CPPM compatible servos. No receiver channel limits (except by those on your transmitter) and prevent mismatched servo-channel connection
2) Two selectable failsafe setting options (use native failsafe on radio side or set failsafe on TFR4SB side)
3) Improved sensitivity and stability
4) Wider and higher operating temperature range, suitable for all kinds of models