The T-Motor F66A 32Bit 66A 3-6S 20x20 4in1 ESC is a great choice for RC hobbyists. Whether you're into racing or just having fun with your RC vehicle, this ESC can handle it. With a size of 43x34x13.5mm and weighing only 21g, it's lightweight and easy to install. It has an input voltage range of 3-6S, a current of 66A with a burst current of 77A, and comes with BLHeli32 firmware. It also has a PWM frequency of 16-48KHz and mounting holes of 20x20 M3. Get yours today and take your RC experience to the next level!