If you're building a quadcopter in India, the ESC is one of the most critical parts you'll choose. The SimonK 30A ESC is popular with drone hobbyists because it's affordable, reliable and easy to calibrate. Why SimonK? https://this-esc254708.onesmablog.com/30a-simonk-brushless-esc-the-reliable-pick-for-fpv-quadcopters-83575620