Description: 1. This DC Motor Speed Regulator controls the speed of a DC motor by adjusting pulse-width-modulation (PWM). 2. Control the forward or reverse direction and the stop of the DC motor with the button switch. 3. Press the green button, the motor rotates backwards; and release the button, the motor stops. 4. Press the red button, the motor rotates clockwise; and release the button, the motor stops. Feature: 1. Input voltage: 6V - 24V DC 2. PWM frequency: 21 kHz; 3. Adjustable duty cycle: 0% -100% 4. Current rating: 30A 5. Potentiometer with switch function 6. The display range of the three-digit LED display is "000" - "100". (For example, "055" is displayed, meaning the PWM output cycle is 55%.) 7. Product dimensions: 57 * 37 * 21 mm Package includes: 1 x PWM motor speed controller