[ DC motor speed controller]DC voltage 12V or 24V. Overload current: 10A. Support high power, 12V/120W, 24V/240W This electronic DC stepless speed controller is a controller with a radiator, which can ensure better heat dissipation. The speed regulation of the DC motor is convenient, and the knob screw is easy to use.[Product size]DC motor speed regulation: 2.5 inches x 1.4 inches x 1.28 inches; Knob cap diameter: 0.54 inches; Cable length: 4.54 inches[Wiring method] The black wire is connected to the negative pole of the power supply, the blue wire is connected to the negative pole of the motor, and the red wire is connected to the positive pole of the power supply and the motor[Wide Use]Motor speed governors are widely used to adjust fan speed control switches, defrosters, DC motor speed and control car heaters.Colour:blackMaterial:MetalPackage Contents:3 x dc motor speed controllerOnly the above package content, other products are not included.Note: Light 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." Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.