Direct current motors are easy to speed, have simple wiring, and are to use, excellent substitute for damaged motors Extra long knob screw to meet installation requirements 12V24V7A electronic stepless speed controller, direct current motor speed control switches, motor speed control switches Widely used in DC12V-24V electrical appliances Adjust motor speed, control of car fan heater, defroster, fan speed regulation, and more This electronic continuously variable speed controller is upgraded fan heater controller with a radiator, ensuring better heat dissipation connection the red wire to the positive poles of the motor and the positive poles of the power supply, connection the black wire to the negatived poles of the power supply, and connection the blue wire to the negatived poles of the motor, Manufacturer: APGLSXY