From the Manufacturer

The Velineon VXL-3s forward/reverse electronic speed control simplifies brushless technology with easy, built-in profiles and intuitive programming. Tri-mode operation auto detects the motor type for brushed, sensored or sensorless brushless motors. The VXL-3s uses advanced circuit design that allows sensorless brushless motors to operate with the smoothness and precision of the best brushed systems. It sets up, operates, and programs just like the Traxxas XL-5 family of ESCs so there’s no tricky new procedures to learn. Traxxas’ exclusive patent-pending Training Mode is also included to limit full throttle to 50% for young or inexperienced drivers. For the most advanced users, the VXL-3s is equipped with two-stage low voltage detection to allow LiPo battery use, including powerful 11.1-volt 3S packs. The Velineon 3500 Brushless Motor uses ultra high-temperature Neodymium magnets, high-speed ball bearings, and a precision balanced rotor for power and long-life. Since there are no brushes or commutator to wear out, the need for maintenance is virtually eliminated. The Velineon 3500 delivers consistent, high-power output, run after run.