1、DC Motor Speed Regulator controls the speed of a DC motor by adjusting Pulse‑Width‑Modulated (PWM). 2、The input power range is DC6‑28V. 3、Duty Cycle adjustable range is 5%‑100%. 4、Control the forward or reverse direction and the stop of DC motor by switch. 5、Potentiometer with switch function. 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*15mm Operating 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 CONTROLLER 1. Connect wires refer to the "wiring diagram" (NO.4 picture) 2. Turn on the power, and adjust the potentiometer 3. The LED indicates the power up and the speed of motor Package Includes: 1 x DC Motor Speed Controller