Speed Controller with Digital Display PWM motor speed control with DC Switch Features PWM Motor Speed Controller is made of high quality printed circuit board material, which has good durability and wear resistance to ensure long term service. Easy installation and operation: Speed controller with screw terminals for quick and convenient wiring comes with a start switch / adjustable momentary stop and a speed control potentiometer to ensure easy and convenient control. LED display showing percentage of actual speed at maximum speed Support DC 6V to DC 60V input voltage, and fit 12V, 24V, 36V, 48V, at the same time the output current is 0A-30A , which guarantees a wide application .