Product information "Hobbywing Xerun Axe540 R2-2300kV FOC Combo for Rock Crawler" Intelligent torque and speed control for precise driving maneuvers! The XeRun AXE "R2" brushless controller, connected to an associated AXE "R2" motor, automatically regulates torque and speed depending on the load requirement. This technology is also called FOC (Field-Oriented Control) and is responsible for this really great driving experience. The XeRun AXE "R2" 540 motor with its 3.175mm shaft and 2300KV also contributes to this. With the built in staggered pole rotor design patented by Hobbywing, the 4-pole motor has hardly any detent torque and runs smoothly under all conditions. With the professional handbrake function, the car is now 100% immobile, even on the steepest slopes. The motor and controller are both connected via an improved waterproof, special sensor plug. The ESC also offers extensive setting options for all professionals. Connected via Bluetooth and APP, relevant data can be read out, settings changed or firmware updates carried out, everything is simple and easy.