The EMX-AC-1171 is a brushless motor controller from EMAX. It has a maximum operating voltage of up to 45V and can handle the continuous current of up to 20A without the overheating issue. This controller is suitable for DC brushless motor applications that require high speed and torque. It operates in a wide temperature range from -20? - +80? and is capable of low EMI performance. This controller is powered by an advanced processor, making it possible for the user to modify and adjust its settings such as motor speed, accelerating and decelerating time. Additionally, the EMX-AC-1171 is able to provide alarm protection such as motor overload, low voltage, and over temperature.