ZTW Beatles series ESC is a beginning level product line for fixed wing. This line product is specially designed for the beginner who is sensitive to price and performance. Also it is ready to use right out of box, every default is set for the best convenience of the customer, no programming needed. If you like to program for a change you can use our air program card (sold separately).It features light weight, small size, super smooth start up and throttle linearity, multiple protection, low cost and best performance at this level of product.