The XR10 PRO Stock Spec 1S ESC is very light at only 28.5g and features the super internal BEC with a maximum output of 6A and adjustable voltages between 6V and 7.4V. This will allow the use of a variety of servos without the use of an external a receiver pack. The adjustable brake and PWM frequencies allow you to fine tune your ESC to suit your driving style and track conditions and is adjustable with the optional programmer card or the WiFi express module.