This is the Hobbywing 540 AXE FOC Waterproof V1.1 Sensored Brushless Combo with 2300kv motor.

V1.1 Firmware (01-00.2.01) for the XeRun AXE ESC has improved the following features: 

• RPM/Throttle Matching - 3 Settings: RPM/Throttle Matching, allows you to adjust the way your system will react to changes in load/terrain on trail. The setting can be used to create a "brushed motor" feel. If you like the way a brush motor drives, use setting #1. Setting #2 (Default) is like the original ESC. Setting #3, improves the consistency of the motor RPM over different loads.
• Setup Process - Automatic Motor Pairing Improves: Loose rear endplate, severe impact, or abnormal heat (during the operation) abnormal power output occurs to the motor. This process allows you to reset your motor F.O.C. for the update and calibrates the motor sensors to the firmware. See below for complete details and the simple walk through.
• Motor "punch" or instant start up: The motors response to instant throttle inputs, or "clicking" to full throttle has been improved.
• Drag Brake: Minor changes to how the drag brake operates to to be more smooth and responsive.
• Motor Operation: Improved high rpm efficiency.
• More RPM: Overall, slight gains in RPM, and basic performance
• 550 Size Motor: Update includes additions for the AXE 550 size 2700 and 3300 kv motors

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 updated 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.  

Applicable to All Weather & Track Conditions 
The IP-67 waterproof ha