Features:- DC Motor Speed Regulator controls the speed of a DC motor by adjusting Pulse-Width-Modulated (PWM)- The input power range is DC6-28V- Duty Cycle adjustable range is 5%-100%- Control the forward or reverse direction and the stop of DC motor by switch- Potentiometer with switch function- The switch cable length 15cm- Item size: 32mm*50mm*15mmOperating instruction:Before you attempting to wire the controller, make sure power is off.WARNING: DO NOT REVERSE POSITIVE AND NEGATIVE POWER LOADS. THIS WILL DAMAGE THE CONTROLLER1. Connect wires refer to the "wiring diagram" (NO.4 picture)2. Turn on the power, and adjust the potentiometer3. The LED indicates the power up and the speed of motorPackage Includes:1 x DC Motor Speed ControllerPackage List1DC Motor Speed Regulator controls the speed of a DC motor by adjusting PulseWidthModulated (PWM). 2The input power range is DC628V. 3Duty Cycle adjustable range is 5%100%. 4Control the forward or reverse direction and the stop of DC motor by switch. 5Potentiometer with switch function.