Adapter cable for Tekin Servos and pre-GEN2 ESCs that do not have a Data Port. Connects HotWire 3.0 through the ESC/Servo receiver plug. USB connection only, Bluetooth function not available on the below ESCs or servos: For use with: All Tekin Servos RX8 GEN1 RS/RS PRO FX FXR FX PRO FXR PRO B1 B1R