2pcs 12V/24V DC Motor Speed Controller Universal, Knob Screw Electronic Stepless Speed Regulator Switch Versatile Application: This DC motor speed controller is designed for automotive use, effectively managing fan heaters, defrosters, and other automotive fans. It supports both 12V and 24V systems, with a maximum load of 120W at 12V and 240W at 24V. Advanced Construction: Built with a durable heat sink for improved heat dissipation, this electronic stepless speed regulator ensures long-term reliability. The adjustable knob allows precise control over motor speed, providing smooth and continuous regulation for various applications. Hassle-Free Installation: Simple wiring connections – connect the red wire to the positive terminals of the power supply and motor, the blue wire to the negative terminal of the motor, and the black wire to the negative terminal of the power supply. Designed for quick and secure setup. Universal Usability: Suitable for a wide range of DC motor applications, including automotive fans and other DC-powered equipment. Ideal for both DIY projects and professional use. Color: Black Material: Plastic Package Contents: 2 x Electronic Stepless Speed Controller Note: The actual product may vary slightly in color due to lighting and display differences. Measurement may vary by +/- 1-3 cm. Only the items listed are included.