This motor speed controller features two original low internal resistance MOS tubes and a pre-stage driver for improved and stable performance, supporting high current and high frequency operation. It includes a start-stop button and can be controlled via an external switch to meet various control requirements. The controller allows setting of minimum value, maximum value, and working frequency, enabling users to customize operation based on their motor or LED characteristics. The minimum value setting prevents the motor from failing to start or lights from not turning on at low settings, while the maximum value setting avoids excessive motor speed or LED brightness at full output. Equipped with a digital encoder knob, this speed regulator offers higher precision, better consistency, and no drift compared to standard potentiometers, allowing accurate adjustment to desired levels. The adjustment step value can be set from 0.1 to 25, supporting both fine and coarse control. Start and stop times are adjustable from 0.0 to 9.9 seconds. Soft start functionality eliminates inrush current, providing effective motor protection and extending motor lifespan. Housed in a standard 5135 instrument case with back cover for easy installation. Material: ABS + electronic components Color: Black Package Contents: 1 x Motor Speed Controller Note: Light and display differences may cause slight color variations between the image and actual item. Measurement tolerance: +/- 1-3 cm.