Features: 100% brand new and high quality Using two original low internal resistance MOS transistors, as well as pre-driver, the performance is better and more stable, supporting high current and high frequency. The minimum, maximum and operating frequency can be set to facilitate the operation and use of customers according to the operating characteristics of their own motors or LEDs. The digital encoder knob adjusts the motor speed, which is higher in accuracy and consistency than ordinary potentiometers, and will not drift. The start time and stop time can be set to 0.0-99 seconds; the motor soft start, no impact current, effectively protect the motor, and extend the service life of the motor. It comes with a start-stop button and can be controlled by an external switch to meet customers various control needs. (Note that the external switch needs to use a self-reset button or button, press it to turn it on, and then press it to turn it off; the function of always closing the output on and not closing the output is not possible.) Package Includes: 1x Motor Speed Controller Specifications: Size: Approx. 79x26x43mm/3.11x1.02x1.69inch Working Voltage: DC5V~30VDC(note That the Positive and Negative Poles Are Not Reversed, and Do Not Connect to AC) Rated Current: 12A, Maximum Current 20A Maximum Power: 360w Working Frequency: 1khz~99khz Adjustable, 1khz Step, Default Frequency 20khz, Accuracy About 1% (the Higher the Frequency, the More Heat the Mos Tube Will Heat, Try to Choose a Low Frequency) Display Value Range: 00.0-100 Adjustable Slow Start/stop Time: 0.0-99 Seconds Step Size: 0.1-25 Step Can Be Selected Weight: Approx. 42g note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.