Features: 1Anti Interference Ability: The power input terminal adopts the electrolytic capacitor with ultra low impedance and large capacity, which greatly improves the anti interference ability 2Safety Powering On Function: When powering on, no matter the throttle rocker is in any position, the motor will not start immediately to avoid personal injury. 3Throttle Stroke Calibration Function: 30A ESC can adapt to the difference of throttle stroke of different remote controllers, and improve the linearity of throttle response. 4Good Features: The 30A ESC brushless speed controller has a smooth, delicate speed control feel and first class speed regulation linearity. 5Low Voltage Protection Mode: The 30A ESC brushless speed controller reduces power and turns off output, and the default is to reduce power Package included: 1 x ESC 1 x Manual