Features:equipped with start-stop button, and can be external switch control, to meet various customer control requirementsmotor soft start function. When starting the motor, the current increases slowly and there is no shock current, which can effectively protect the motor and prolong its service lifeduty cycle, duty cycle upper and lower limits and working frequency can be set to facilitate customers to operate and use their motors according to their working characteristics.digital encoder knob adjusts motor speed, which is more accurate and consistent than ordinary potentiometer.with standard 5135 instrument shell, convenient for customer installation. Specifications:100% brand newMaterial: PlasticColour:grayworking voltage: DC5V~30V, input anti-reverse connection protectionrated current: 5A maximum current 15Amaximum power: 150Wworking frequency: 1KHz~99KHz adjustable, 1KHz step, default frequency of 20KHz, accuracy of about 1%duty cycle: 0-100%, 1% stepSizeAs shownPackage Includes:1 X ModuleNote:Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!