Features:_x000D_ - DC Motor Speed Regulator controls the speed of a DC motor by adjusting Pulse-Width-Modulated (PWM)_x000D_ - The input power range is DC6-28V_x000D_ - Duty Cycle adjustable range is 5%-100%_x000D_ - Control the forward or reverse direction and the stop of DC motor by switch_x000D_ - Potentiometer with switch function_x000D_ - The switch cable length 15cm_x000D_ - Item size: 32mm*50mm*15mm_x000D_ _x000D_ Operating instruction: _x000D_ Before you attempting to wire the controller, make sure power is off._x000D_ WARNING: DO NOT REVERSE POSITIVE AND NEGATIVE POWER LOADS. THIS WILL DAMAGE THE CONTROLLER_x000D_ 1. Connect wires refer to the "wiring diagram" (NO.4 picture)_x000D_ 2. Turn on the power, and adjust the potentiometer_x000D_ 3. The LED indicates the power up and the speed of motor_x000D_ _x000D_ Package Includes: _x000D_ 1 x DC Motor Speed Controller