Features Well made with high quality circuit board Long service life Simple and easy-to-use Small size and elegant appearance Stable performance Features: Well made with high quality circuit board Long service life Simple and easy-to-use Small size and elegant appearance Stable performance Maximum current up to 20A Heat sink and fan required Antistatic bag for protection during transportation Positive and negative polarity must be connected correctly Wiring should not touch heat sinks Module must be connected to motor first to control speed 1-3mm measurement error possible Color may appear slightly different from photos Ensure motor is connected before use How to use: 1. Ensure the positive and negative polarity is correctly connected. 2. Avoid wiring touching heat sinks to prevent circuit board damage. 3. Connect the module to the motor first in order to control the speed. Package Included: 1 x DC Motor Speed Regulator Controller Switch Note: Please allow a small measurement error and keep in mind that the item color may appear slightly different from the photos due to variations in monitor calibration. Ensure proper connections and usage to prevent damage. Package List