1、Potentiometer Adjustment: This DC motor speed controller can adjust the motor speed by potentiometer, the adjustment range is 0% to 100%. 2、Pulse Width Modulation: This DC motor speed controller uses the pulse width modulation (PWM) method for dimming h or speed regulation, which makes full use of the power supply's energy and the circuit is highly efficient. 3、Rotary Switch: This DC motor governor uses a rotary switch, short press the knob to turn it on, the decimal point lights up after the third digit, it stops and the decimal point disappears. 4、Delayed Start And Stop: This DC motor governor has delayed pneumatic and stop function, long press the knob to enter the parameter setting interface display C, set the slow start and stop time is 1 to 10 seconds. 5、Wide Application: This DC motor speed controller is widely used for powering small power motors, electric motors, fans, water pumps, hand drills, LED lights, stereos, amplifiers and other DC products.