Fully waterproof design for all conditions. (Note: Please clean and dry it after use for avoiding rusty connectors). HOBBYWING patented copper heat-conductive plates attached to the MOSFET board allows the internal heat to be quickly transferred to the aluminum heat sink for great heat dissipation. Built-in switch-mode BEC with cont. current of 4A. Tunable drag brake and drag brake rate for different vehicles, tracks, and control feel. Adjustable PWM frequency combined with advanced freewheeling (/DEO) technology guarantees great throttle linearity and driving feel. 9 levels of acceleration/ punch from soft to aggressive for different vehicles, tires and tracks. Proportional brake with 9 levels of initial brake force, maximum brake force, and drag brake force. Multiple protections: low-voltage cutoff protection, thermal protection, and throttle signal loss protection. Separate programming port to easily connect the LED program card to the ESC. ESC programming via HOBBYWING LED Program Card.