Brand new BionX RC3 Control Unit / Throttle The Bionx RC3 is a stand alone controller and throttle for the Bionx electric bike systems. It includes a brake switch connection and shows assist and regeneration levels, state of charge, light and on/off with assistance and select/scroll buttons. The RC3's LED indicators allow it to serve as a stand-alone remote controller. It can also be paired with the BionX DS3 Display for a larger view and bluetooth integration with your phone.