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 6V 12V 24V 28V. Features: Control and adjust the speed of a DC motor with this controller Light weight, heavy current, wide voltage High reliability. High efficiency, high torque, low heat generation New generation of 6V 12V 24V 28V 3A DC Motor Pump Speed Controller Thickened copper sheet and PCB balanced arrangement of heavy current Specification: Operating voltage: DC6V-28V Current: 3A Material: PCB & Plastic Item size: 6.5 * 3.1 * 1.3cm / 2.56 * 1.22 * 0.51in(L * W * H) Item weight: Approx. 18g / 0.63oz Package size: 10.9 * 7.9 * 1.5cm / 4.29 * 3.11 * 0.59in(L * W * H) Package weight: 19g / 0.67oz Package List: 1 * PWM DC Motor Speed Regulator Controller Switch Note: The package without user manual.