12V 24V Universal Motor Speed Controller Electronic Switch Stepless Speed Controller Defrost Controller With Q81 Heat SinkCOOTDTYChems: 100% Brand New And High QualityUniversal: 12V or 24V, Supporting High Power. Wiring: the red wire is connected to the power supply and the positive pole of the motor, the blue wire is connected to the negative pole of the motor, and the black wire is connected to the negative pole of the power supply. Heat Dissipation: This electronic stepless speed controller is an upgraded fan heater with heat sink that will provide better heat dissipation. Wide range of applications: suitable for 12-24V DC electrical appliances. Adjust engine speed, car heater, defrost, fan speed control, etc. Easy to use: the motor speed control is convenient and the wiring is simple. It is an excellent substitute for a power failure. Extra-long knob screws to meet your installation needs. Specification: Material: Metal + Plastic Model: 10A Infinite Switch/20A Infinite Switch/Infinite Switch with Heat Sink/Infinite Switch Without Heat SinkSize: Approx. 8x3.2x3.5cm/3.14x1.25x1.37inchVoltage: DC 12V-24VMrated Voltage: 12V/200W; 24V/400A Package Includes: 1x Controller SwitchNote: 1. Please allow 1-2cm errors due to manual measurement, please make sure you do not mind before ordering.2. Due to the difference between different monitors, the picture may not reflect the actual color of the item.