Only 63x27x10.5mm, Smaller but more productive!!!The FrSky Redundancy Bus is a unique switchboard module that can operate 2 receivers and 2 batteries to provide you with total peace of mind when flying your model. You can also run your servos from the switchboard with complete protection from high voltage overload.The Redundancy Bus also supports Smart Port telemetry for your Taranis and will provide telemetry feedback for voltage and overload indication.