Feature: 1. Practical: The RC motor electric speed controller is the fixed wing special core program that greatly improves the throttle response speed. 2. Stable Flight: The throttle signal is twisted pair, which effectively reduces the crosstalk generated by signal transmission in the copper wire, making the flight more stable. 3. Accelerator Signal Frequency: The accelerator signal frequency with a refresh rate up to 621Z can be supported that is compatible with various flight controls. 4. Highly Intelligent: This ESC is highly intelligent and has strong adaptive ability. It is easy to use only the entry angle setting item, high entry angle, intermediate entry angle. 5. Highly Compatible: The RC speed controller is compatible with multi rotor program, power input, 2 to 3 lithium batteries or 5 to 9 nickel metal hydride. Specification: Item Type: 40A RC Brushless ESC Material: Silicone, copper, electronic components Gross Weight: 50g/1.8oz Output Capacity: Continuous current 40A, short time current 55A, 10 seconds Power Input: 2 to 3 lithium batteries or 5 to 9 nickel metal hydride BEC Output: 3A/5V BEC Type: Linear voltage stabilization Applicable: Empty mold. Package List: 1 x 40A RC Brushless ESC1 x Instruction Manual 2 x Rubber Ring Note: 1. Please allow 1 to 3mm error due to manual measurement. Please make sure you don't mind before ordering.2. Due to different shooting lights and different monitors, the pictures may not reflect the actual color of the real object. Please make sure you don't mind before ordering, thank you!