Description: 1. The DC motor speed controller controls the speed of the DC motor by adjusting the pulse width modulation. 2. Forward or reverse direction and stop of DC motor is controlled by push button switch. 3. Press the green button to reverse the motor; Release the button and the motor stops. 4. Press the red button and the motor rotates clockwise; Release the button and the motor stops. Features: 1. Input power voltage: 6V - 24V DC 2. PWM frequency: 21khz; 3. Duty cycle adjustable: 0% - 4. Rated current: 30A 5. Potentiometer with switching function 6. The display range of the three-digit LED display is 000 - 100. (for example, l 055 display indicates 55% PWM output duty cycle) 7. Product size: 57*37*21mm Package includes: 1 motor speed controller