This motor speed controller features two original low internal resistance MOS tubes and a pre-stage driver for improved performance and stability, supporting high current and high frequency operation. It includes a start-stop button and can be controlled via an external switch to meet various customer control requirements. The controller allows setting of minimum value, maximum value, and working frequency, enabling convenient operation based on specific motor or LED characteristics. The minimum value setting prevents the motor from failing to rotate or lights from not turning on at low settings, while the maximum value setting avoids excessive motor speed or LED brightness at full display. Equipped with a digital encoder knob, this speed controller offers higher precision, better consistency, and no drift compared to standard potentiometers, allowing accurate adjustment to desired values. The adjustment step value can be set between 0.1 and 25, accommodating diverse user needs, with options for fine or coarse control. Start and stop times can be configured from 0.0 to 9.9 seconds, supporting soft start functionality that eliminates inrush current, effectively protecting the motor and extending its 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 (only the item listed, other products not included) Note: Lighting and display differences may cause slight color variations between the image and actual item. Measurement error allowance: +/- 1-3 cm.