Features: ESCs main control: control+drive 2-in-1 integrated chip, QF32F4A = AT32F421 + ID6288. MOS transistors model: HYG022N04LS1C1, On-Resistance of 2.0mΩ (compared to other similar products that use MOS internal resistance of around 3mΩ), withstands voltages of 40V, 6S Lipoes stable operations. Onboards 12pcs 0805 capacitors, each with capacity of 2.2uF, totaling 26.4uF, far exceeding other similar products, providing stable power filtering. for model, car model. 32-bit main control, support SineWaves startup, factory flashed AM32 firmware, fixed wing aircraft and racing drones can be used directly. ESCs can also flash BL32 firmware or HF32 (Please contact us if you need). Not onboards BEC, can be used for mosquitoes car, car models require external BEC for use. Specifications: Materials: ABS Size:22.7x13.8x3.8mm/0.89x0.54x0.15inch Package Includes: 1Set Mini ESCs 40A V1 Single Unit note: Please allow 0-1cm error due to manual measurement. make sure you not mind before bid. Due to the differences between different monitors, the Pictures may not reflect the actual of the item.