ProTek RC 370TBL "Black Label" Waterproof High Torque Brushless Crawler Servo (High Voltage/Metal Case) (Digital)NOTE: During testing, we found that some Tactic receivers included with the SCX10 II RTR do not communicate well with high performance servos, and may not function properly with this servo. For best results, and the peak performance, we recommend you power this servo with a BEC. If you experience glitching or poor performance while using a Futaba transmitter, you must turn off BLS mode. BLS mode is only compatible with Futaba BLS type servos.