Product Description Two 12V/24V DC motor speed controllers, universal type, knob screw electronic stepless speed switch g20241386100. Wide Applications: This DC motor speed controller is an essential accessory for automotive modifications, seamlessly managing the operation of fan heaters, defrosters, and other automotive fans. It ensures optimal performance in both 12V and 24V applications, supporting up to 120W at 12V and up to 240W at 24V. Advanced Construction: This universal electronic stepless speed controller features a robust heatsink design, enhancing heat dissipation and extending the controller's lifespan. The intuitive knob design allows for precise speed adjustment, ensuring user-friendly operation. Easy Installation: Wiring is simple—connect the red wire to the positive terminal of both the power supply and the motor, the blue wire to the negative terminal of the motor, and the black wire to the negative terminal of the power supply. This ensures a safe and reliable installation. Versatile: Suitable for a variety of applications, from controlling automotive fan speeds to regulating DC-powered equipment. Its versatility and reliability make it an essential tool for DIY enthusiasts and professional technicians. Slight color variations or differences may exist between the actual product and the specifications, but this will not affect its use. Color: Black Material: Plastic Package Contents: 2 electronic continuously variable speed controllers