Features: 1. Brushless ESC: Hobbywing Skywalker RC ESC Brushless 40A/40A V2 are original genuine products to ensure the first-class quality and high reliability of the electric regulator. 2. Excellent Performance RC ESC: The speed controller has strong resistance to current. Throttle stroke can be set, compatible with various remote controls. With smooth, delicate speed control feel, first-class linear speed regulation.The maximum speed can reach 210000 RPM (2-pole motor), 70000 RPM (6-pole motor) and 35000 RPM (12 pole motor). 3. Protection Function: With input voltage abnormal protection, battery low voltage protection, overheating protection, throttle signal loss protection and other multiple protection functions. 4. Three Start Modes: Normal start, soft start and super soft start, compatible with fixed wing aircraft and helicopter. 5.Excellent Service:Reach out regarding any questions, such as sizing, scale, or help with assembly. I want you to be happy with your purchase and satisfaction guaranteed. Please check your specific model #39;s manual for compatibility,or Contact us before auction. Specifications: High Voltage/Regular: Regular Wire Red-14AWG-100mm*1 Wire Black-14AWG-100mm*1 Output Wires: Black-14AWG-75mm*3 Output connectors: 3.5 gold connectors (female) Transmitter: Supported LED Program Card: Supported Firmware Upgrade: No The difference between Skywalker-40A and Skywalker-40A-UBEC: SKYWALKER 40A ESC BEC Cont./Peak Current: 40A/55A Input: 2-3S lipo BEC Output: 5V,3A(Linear mode) Program Port: Program/Throttle Wire SKYWALKER 40A V2 ESC UBEC Cont./Peak Current: 40A/60A Input: lipo 3-4S BEC Output: 5V,5A(Switch Mode) Program Port: Program Wire Firmware -MODEL EQUIPMENT INDONESIA-