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, handling up to 120W at 12V and 240W at 24V for reliable performance. Advanced Construction: Built with a durable heat sink, this electronic stepless speed regulator improves heat dissipation for extended controller life. The simple knob design allows precise speed adjustment, ensuring easy and intuitive operation. Hassle-Free Installation: Features a straightforward wiring setup—connect the red wire to the positive terminals of the power supply and motor, the blue wire to the motor's negative terminal, and the black wire to the power supply's negative terminal for a secure connection. Universal Usability: Suitable for a variety of applications, from controlling automotive fans to regulating DC-powered devices. Its adaptability and dependable performance make it a practical tool for both DIY users and professional technicians. Note: The actual product may vary slightly in color due to lighting and screen display differences, which does not affect functionality. Color: Black Material: Plastic Package Contents: 2 x Electronic Stepless Speed Controller Note: Only the items listed are included. Note: Slight variations in color may occur due to lighting and display settings. Measurement tolerance is +/- 1-3 cm.