Digital encoder knob to adjust motor speed, higher and better consistency than ordinary potentiometer adjustment, no drift Motor soft function, the current increases slowly when starting the motor, no inrush current, effectively protect the motor and prolong the life of the motor. Adopt two high voltage and low internal resistance MOS tubes, as well as the front-stage driver, better and more stable performance, support for high-voltage and high-power, Weight: 0.29321480846 pounds, Manufacturer: Kueohse