Features Control the forward or reverse direction and the stop of the DC motor by switch. The input power range is DC6-28V. The DC motor speed controller controls the speeds of a DC motor by adjusting the pulse width modulation (PWM). Potentiometer with switching function. The adjustable range of the working cycle is 5% to 100%. Instruction manual: Before trying to wire the controller, make sure the power is off. WARNING: DO NOT Reverse POSITIVE AND NEGATIVE CURRENT LOADS. THIS WILL DAMAGE THE CONTROLLER 1. Connect the wires, see "Wiring Diagram" (Picture #4) 2. Turn on the device and adjust the potentiometer. 3. The LED indicates the power on and the speed of the motor. Features: - The switch cable length: 15 cm. - The adjustable range of the working cycle is 5% to 100%. - Potentiometer with switching function. - Speed controller for DC motors controls the speeds of a DC motor by adjusting the pulse width modulation (PWM) - The input power range is DC6-28V. - Control the forward or reverse direction and the stop of the DC motor by switch. - Item size: 32 mm x 50 mm x 15 mm. Package includes: 1 x DC Motor Speed Controller Package List