1、The current of this motor speed controller can be adjusted from 1A to 10A, and it is simple to set 2、Suitable for motors of which voltage is 12V with power less than 120W and that is 24V with power less than 200W 3、The positive and negative pole of motor can be connected one way or another. Exchange the pole when the rotation direction is not as expected, exchange the pole 4、Rotate the knob to change output so to change the revolving speed of motor 5、Please make sure the positive and negative polarity is connected correctly, otherwise the controller will be damaged Description: This is a simple and easy-to-use DC motor speed controller of small size, elegant appearance and stable performance. It is made with high quality circuit board which ensures a longer service life. The current can be adjusted from 1A to 10A which is quite convenient to set. Features: The current of this motor speed controller can be adjusted from 1A to 10A, and it is simple to set. Suitable for motors of which voltage is 12V with power less than 120W and that is 24V with power less than 200W. The positive and negative pole of motor can be connected one way or another. Exchange the pole when the rotation direction is not as expected, exchange the pole. Rotate the knob to change output so to change the revolving speed of motor. This controller can not be connected to alternating current, or it will be burnt. Please make sure the positive and negative polarity is connected correctly, otherwise the controller will be damaged. Specifications: Resistance: 100K Wire Length: 40cm Voltage Range: DC10V~40V(DC12~36V suggested) Power: 12V*10A=120W;24V*10A=200W,.....36V*10A=360W Current: 10A(rated), 15A(Max.), adjustable from 1A to 10A Speed Adjustable 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