1203BB 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: 1.3*2*0.4 inches; Net Weight:1.13 ouncesOperating instruction: Before you attempting to wire the controller， make sure power is off. WARNING: DO NOT REVERSE POSTIVE 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 Including: 1 x DC Motor Speed Controller