It is designed for control and adjust the speed of a DC motor. The output of the speed controller is DC which will not damage the governor. The applied voltage is 12V 24V 36V 48V. Features: Control and adjust the speed of a DC motor with this controller. High reliability. High efficiency, high torque, low heat generation. Use soft heat-resistant silicone line. New generation of 9-60V 20A DC Motor Pump Speed Controller. Thickened copper sheet and PCB balanced arrangement of heavy current. Specification: Operating voltage: DC9V-60V Quiescent current: 18A PWM duty cycle: 0%-100% Material: Metal & Plastic Item size: 7.6 * 4.4 * 2.6cm / 2.99 * 1.73 * 1.02in(L * W * H) Item weight: Approx. 70g / 2.47oz Package size: 14.8 * 10.9 * 3cm / 5.83 * 4.29 * 1.18in(L * W * H) Package weight: 72g / 2.54oz Package list: 1 * PWM DC Motor Speed Regulator Controller Note: The package without user manual.