Versatile Application: This DC motor speed controller is designed for automotive use, effectively managing the operation of 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 to enhance longevity. The simple knob design allows for precise speed adjustment, providing easy and intuitive control. Hassle-Free Installation: Features a simple wiring setupconnect 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 fan speeds in vehicles to regulating DC-powered equipment. Its adaptability makes it a practical tool for both DIY users and professional technicians. 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 screen display differences. Measurement may vary by +/- 1-3 cm.