Features:– 1203B DC Motor Speed Regulator controls the speed of a DC motor by adjusting Pulse-Width-Modulated (PWM).– The input power range is DC 6V-28V .– Duty Cycle adjustable range : 0%-100%.– Item Size: 1.3*2*0.4 inchesOperating Instruction: 1. Connect wires refer to the wiring diagram2. Turn on the power, and adjust the potentiometer.3. The LED indicates the power up and the speed of motor.Note:1. Before you attempting to wire the controller, make sure power is off.2.Do not reverse positive and negative electrical loads. This will damage the controller. Package Included:1 x DC Motor Speed Controller