Traxxas Waterproof MXL-6S Brushless Power System Patented Traxxas High-Current Connector eliminates a common bottleneck and maintains pure, unrestricted power flow Built-in low voltage detection for Lithium Polymer (LiPo) battery use provides a clear signal Advanced circuit design allows sensorless brushless motors to operate with the smoothness and precision of the best brushed systems Multi-color LED provides clear feedback Thermal shutdown protection prevents the MXL-6s from overheating