The Hobbywing XR10 Justock G3SS Sensored Brushless ESC/SD G2.1 Motor Combo has been designed with fixed, 0°, timing for spec class racing. The included SD G2.1 motor is an ideal stock motor for both 1/10 and 1/12 on and off-road racing. These two components paired together make for an ideal choice for beginners and experts alike. Features: ESC: Built-in polarity protection. The XR10 Justock has integrated MOSFET’s that if the battery terminals are connected in reverse, the MOSFET will be reverse-biased and will not allow current to flow through the system Programmable via OTA Wireless module or 3in1 program box Built-in capacitor module eliminates the need for external capacitors and unwanted space RPM speed limit function supports up to 6 different speed, RPM, selections to meet the needs and demands of various competitions in the world (Set through OTA module or 3in1 box) Internal ESC timing has been set to 0 degrees and cannot be adjusted for stock racing Built-in BEC can support a maximum output current of up to 8A. Output voltage can be set between 6V or 7.4V Calibration or performing a factory-reset can be achieved by using this SET button. Simple and easy to use Supports both CCW (counterclockwise) and CW (clockwise) motor directions Protection functions include: reverse polarity, battery voltage, ESC temperature, motor temperature, signal lost and locked rotor protection ESC includes the Freewheeling setting allowing for lower ESC temps enhancing drivability through corners Built-in data logging for post-run reports Motor: Use of a heat-resistant magnet attached aluminum case and double insulated windings, high precision bearings, and rotor with a strong structure guarantees outstanding performance and super durability Built-in Hall sensor non-adjustable end bell combined with a high precision and balanced rotor guarantees the user a smooth and linear power on demand Silicon O-ring seal fitted between the end bell and stator helps to conduct inner heat to the motor case and prevent dust from entering the HALL sensor Detachable structure design for daily cleaning and maintenance can effectively prolong the service life of this Justock motor and improve its operating efficiency This Justock motor is applicable to various 1/10th, 1/12th on-road & off-road vehicles.