Features Suitable for motors whose voltage is 12V with a power below 120W and which is 24V with a power below 200W Turn the knob to change the output to change the engine rotational speeds. This controller can not be connected to alternating current, or it will be burned. The positive and negative poles of the motor can be connected in one way or another. Swap the pole when the direction of rotation is not the expected one, swap the pole Please make sure the positive and negative polarity is properly connected, otherwise the controller will be damaged The current of this motor speed controller can be adjusted from 1A to 10A, and it is simple to adjust Description: This is a simple and easy to use DC motor speed controller with small size, elegant appearance and stable performance. It is made with high quality PCB which ensures a longer service life. The current can be adjusted from 1A to 10A, which is quite convenient to adjust. Specifications: Resistance: 100K. Wire length: 40 cm Voltage range: DC10V ~ 40V (DC12~36V suggested) Power: 12V*10A=120W;24V*10A=200W,.....36V*10A=360W Current: 10A (nominal), 15A (maximum), adjustable from 1A to 10A Adjustable speed range: 0-100% PWM frequency: 21kHz. Size: 85.5mm x 54mm x 27mm/3.36 x 2.12 x 1.06" Package includes: 1 x Motor Speed Controller Package List