The key to the Velineon's brushless power system's extreme power output is total system optimization. The Velineon VXL-3s electronic speed control and 3500kV brushless motor are carefully engineered to work seamlessly together for maximum power flow. High-frequency transistors and advanced circuit design delivers incredibly smooth and refined throttle control with Traxxas EZ-Set one-button convenience. Part Number: 3350R NiMH / 2S / 3S Traxxas compatible The key to the Velineon's brushless power system's extreme power output is total system optimization. The Velineon VXL-3s electronic speed control and 3500kV brushless motor are carefully engineered to work seamlessly together for maximum power flow. High-frequency transistors and advanced circuit design delivers incredibly smooth and refined throttle control with Traxxas EZ-Set one-button convenience.