... Outrunner structure, low RPM, direct drive, electrical speed control, Low noise, High efficiency. High quality NdFeB ... , Outrunner structure, low RPM, direct drive, electrical speed control, Low noise, Super power, High efficiencycontroller: 1 ... speed limitation3. Automatic speed control4. Handle big power5. Short circuit protection6. Shut down electronic power when brake on brushless motor for ...