This mot speed controller uses two iginal low internal resistance MOS tubes a preceding stage driver, which has better perfmance me stable perfmance, suppts high current high frequency. It comes with a start-stop button can be controlled by an external switch to meet control needs of customers. The mot speed controller can set the minimum value, maximum value wking frequency, which is convenient f customers to operate use accding to their own mot LED wking characteristics. The setting of the minimum value avoids the situation that the mot does not rotate the light does not turn on with the value, the setting of the maximum value avoids the situation that the mot is too fast the LED is too bright when displaying 100. This mot speed regulat uses a digital encoder knob to adjust the mot speed. Compared with dinary potentiometers, it has higher precision, better consistency no drift. In this case, you can express to adjust to the value you want. The adjustment step value of this mot speed controller can be set from 0.1 to 25 to meet different customer needs. It can be adjusted slowly finely, quickly roughly. The start time stop time can be set to 0.0-9.9 seconds the soft start of the mot, no impact current, effectively protects the mot prolongs the service life of the mot. The PWM mot speed controller with stard 5135 instrument casing back cover, which is convenient f customers to install. Material: ABSandElectronic components colour: black Package Contents: 1 x Mot Speed Controller Only the above package content, other products are not included. Note: Light different displays may cause the col of the item in the picture a little different from the real thing. The measurement allowed err is 1-3cm.