Description: 【 Motor Speed Controller】: Motor Speed Controller can adjust motor speed and is suitable for automotive fan heater control, defrosting, fan speed control, and more 【Rugged Housing】: Fan Speed Controller is made of lightweight, PP with  wear resistance, ensuring long term use 【Easy Installation】: Electronic Stepless Speed Regulator Switch features an extended knob and screw design for convenient speed control and simple wiring, requiring no additional tools 【12V and 24V Support】: 12V 24V Motor Speed Controller supports 12V/120W and 24V/240W, with an overload current of 10A, and is compatible with 12V or 24V motors, maximizing its application potential 【 Heat Dissipation】: Motor Speed Controller can be used as a fan heater controller, providing enhanced heat dissipation and extending motor life Specification: Material: PP Note: The red wire connects to the power supply and the positive terminal of the motor, the blue wire connects to the negative terminal of the motor, and the black wire connects to the negative terminal of the power supply   Size Chart: 10cmx3.7cm/3.94inchx1.46inch Package Includes: 1 Motor Speed Controller Note: Please allow slightly errors 1-2cm differences due to manual measurement.