If you're building a quadcopter at home, the ESC is one of the most critical parts you'll choose. The SimonK 30A ESC is a go-to for drone hobbyists because it's affordable, reliable and easy to calibrate. Why SimonK? https://geniusbookmarks.com/story21707156/30a-simonk-brushless-esc-the-reliable-pick-for-fpv-quadcopters