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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 inches ? Operating Instruction: ? ?? 1. Connect wires refer to the a??wiring diagrama??? 2. 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