Hobbywing Xerun AXE FOC Waterproof Brushless ESC. 

FOC (Field-oriented Control) for Super Linearity, High Torque & Extreme Silence 
Hobbywing sensor technology has changed the feel, performance, and overall tune-ability of the Axe ESC and Motor in ways some have never experienced. Field-oriented Control is the name of this new tech, and is something never seen before in the scale trail, rock racing, and rc world in-general. This style of sensor allows extremely accurate control and sensing of the motor while maintaining extreme performance and reliability. The motor and ESC are able to match the RPM of the motor to your throttle position under all driving conditions. This greatly improves down hill driving giving this system the ability to drive down hill under complete control. FOC technology also makes the whole system extremely silent, the motor doesn't create any PWM noise when it is running. 

Intelligent Torque Output & Speed, Closed-loop Control for Easy Control 
The FOC sensors, combined with Intelligent Torque output and closed loop speed control mean the ESC and motor will maintain the motor’s Torque level and RPM as the vehicles conditions change. Uphill, down hill, under load, you name it, your Axe system will do what you’re telling it to do. 

Patented “Staggered Pole” Rotor Design for Ultra-low Torque Ripple 
The Axe motor not only has a unique sensor design, but compared to other rock crawler motor designs, the Axe uses an improved staggered pole rotor design. What does this mean? Smoother operation with no cogging, and very clean and consistent deceleration. Smoother brakes, smoother power, and transitions between each are improved. This is specific to trail and rock crawling and allows extremely precise throttle control under any load conditions. 

Battery Reverse Polarity Protection 
The AXE FOC Crawler system has been designed with a very unique feature protecting your ESC from damage caused by Battery Reverse Polarity, so no matter how many times you reverse the battery connections the AXE ESC and the paired motor are safe from damage. Maybe this feature is the first in R/C Car industry. 

Applicable to All Weather & Track Conditions 
The IP-67 waterproof has been taken to a new level with the AXE System. Completely sealed ESC design with robust heatsink case design ensure the ESC is ready for anything you throw at it. The motor as well, is sealed, and combines a Hobbywing exclusive sensor harness. No messy extra steps to make your system water proof. 

High Driving Efficiency for Long Battery Life 
Extremely efficient design comes from a combination of methods. The FOC sensors provided significant improvements to overall motor performance when compared to standard brushless setups. Runtime is increased dramatically while maintaining exceptional levels of power and response. 

Professional Drag Brake Adjustments & Super Parking Capacity 
Drag brake rate, and drag brake tuning allows scalers to adjust not only the hill/hold/drag brake, but how quickly the brake applies. This allows high speed driving without sudden jerks or stops when releasing the throttle. The drag brake itself is super charged, and able to be run at extremely high levels. Compared to a standard crawling brushless setup, the drag brake in the Axe System can be rated at 200% in comparison. 

Innovative Sensor Port 
The sensor harness is more than just water proof, and will take on all elements from water to mud and dirt/dust. No need for anything extra, o-ring sealed, and uses a screw together design to ensure it won’t come loose. 

Built-in