Description: alloy material, sturdy and durable. High temperature resistance, durable and reliable, long service life. How to use: the ESC to the motor the ESC cable to the receiver - turn on the control and push the throttle to the highest point - insert the ESC into the battery - the (123) - beep (confirm the highest point of the throttle ) - after two beeps, pull the throttle stick to the lowest point - hear beeps - (confirmation sound for the lowest point of oil, two beeps for 2S, three beeps for 3S) - OK. The three wires of the brushless ESC ed arbitrarily. If the steering is wrong, you can swap any two wires. If the three wires are reversed, you only need to exchange any two wires. Please note that this is DC, and cannot be directly ed to the and negative poles of the battery or the , otherwise the motor will be directly burned out. Specification: Material:Alloy Size Chart: 27.7x27mm/1.09x1.06inch; Output Shaft Diameter: 3.17mm/0.12inch Includes: (optional) A: Motor B: Motor++ C: Motor+plastic seat+ Note: 1. Please allow slightly error due to manual measurement. 2. Due to the difference between monitors, the picture may not reflect the actual color of the item. 3. Wish you a wonderful on- shopping!