Congratulations and thank you for your trust in Hobbywing product. By purchasing the XERUN XR10 Pro G2S, you have chosen a high performance sensored brushless electronic speed controller! This speed controller is equipped with high-tech features to enhance your experience with Hobbywing brushless power systems. Please take your time and read the following instructions carefully before you start using your speed control. We have the right to modify our product design, appearance, features and usage requirements without Features: 10 select-to-use profiles applicable to all 1/10th RC car racing. Internal electronic key switch for long service life, high reliability; and the external switch port for connecting an external switch (Not included in the packaging box, purchase separately) is applicable to different situations. A separate PRG/FAN port is able to power an external fan to maximize cooling performance or connect an LCD program box or OTA Programmer to the ESC. Variable frequency regulation of PWM & brake frequencies allows users to precisely regulate the driving & braking forces (of the motors). Softening function (HOBBYWING-initiated) for milder or wilder driving control and better driving efficiency. Multiple protections: low-voltage cutoff protection, ESC and motor thermal protection, and fail-safe (throttle signal loss protection), reverse polarity protection (the external standard cap pack will still be damaged if battery reversal occurs). Data logging for recording the maximum ESC/motor temperature, motor speed/RPM, and others in real-time. Firmware upgrade via Hobbywing multifunction LCD program box or OTA Programmer (item sold separately). * The external standard cap pack will still be damaged if battery reversal occurs. For full protection, recommend using HOBBYWING SMT-MLCC capacitor banks (purchase separately)