Usage Tips:2pcs 12V/24V DC Motor Speed Controller Universal,Knob Screw Electronic Stepless Speed Regulator Switch Versatile Application: Essential for automotive enhancements, this DC motor speed controller seamlessly manages the operation of fan heaters, defrosters, and other automotive fans. It assures optimized performance for both 12V and 24V applications, supporting up to 120W at 12V and 240W at 24V. Advanced Construction: Engineered with a robust heat sink, this universal electronic stepless speed regulator enhances heat dissipation, extending the of the controller. The intuitive knob design enables precise speed modifications for applications, ensuring user-friendly operation. Hassle-Free Installation: This controller features straightforward wiring-connect the red wire to the positive poles of the power supply and motor, the blue wire to the motor's negative pole, and the black wire to the power supply's negative pole. This ensures a secure and reliable setup. Universal Usability: Adapted for a wide range out of applications, from controlling fan speeds in automobiles to regulating DC powered equipment. Its versatility and reliability a must-have tool for both DIY enthusiasts and professional technicians. The actual product may have slight color difference or difference, which will not affect the use Colour:Black Material:Plastic Package Contents: 2x electronic stepless speed controller Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.