Features： 1、Stable Working: Using two original low resistance MOS tubes and pre driver, the working is better and more stable, and it supports high voltage and high power. 2、Easier Setting: You can set the duty cycle, the upper and lower limits of the duty cycle and the minimum change value of the duty cycle, which can be operated and used according to the working features of your own motor. 3、Great Accuracy: The digital encoder knob can adjust the motor speed, higher in accuracy and consistency than ordinary potentiometers, and will not cause drift. 4、Motor Starting: Motor soft start function, the current slowly increases when starting the motor, no impact current, effectively protects the motor, and prolongs the service life of the motor. 5、Convenient Uses: Comes with a start stop button and can be controlled by an external switch. The external switch needs to use a self reset button or key, press it once to turn it on, and press it again to turn it off. 6、Standard Design: Power on by default. Also, the factory default frequency is 20KHz, which can meet the requirements of most motors. 7、Easy to Install: With standard 5135 cover and back cover as well, making the installation much easier. Specification： Item Type: Motor Speed Controller Material: ABS Shell Working Voltage: DC 5V-30V, Has input anti reverse protection. Rated Current: Rated 5A, maximum instantaneous current 15A. Duty Cycle: 0-100%, the default step value is 1%. Package List： 1 x Motor Speed Controller