The FrSky RB –20 is a redundancy module that utilizes 2 receivers and 2 batteries to provide you with total peace of mind when flying your models. The RB-20 has a higher operating current and thus supports high-current servos. One of the best improvements to the RB-20 is that it is now able to switch telemetry automatically between RX1 and RX2.
You can run your servos directly from the RB-20 and recieve complete protection from voltage overloads. The RB-20 supports FrSky Smart Port telemetry and provides telemetry feedback for voltage and overload indications.