1、High performance, no noise, high power and efficiency. 2、Use thickened copper foil and 11 core wire, more durable to use. 3、Double power MOS tube has larger heat dissipation area and smaller on-off resistance. 4、The line length is 30cm, which makes it easier to control and operate. 5、Well made with high quality circuit board, easy-to-use DC motor speed controller, long service life. Features: 1. High performance, no noise, high power and efficiency. 2. Use thickened copper foil and 11 core wire, more durable to use. 3. Double power MOS tube has larger heat dissipation area and smaller on-off resistance. 4. The line length is 30cm, which makes it easier to control and operate. 5. Well made with high quality circuit board, easy-to-use DC motor speed controller, long service life. Specification:  Item Type: Speed Regulator Material: Plastic, Aluminum Working Voltage: DC6-30v (output voltage is 0-100% of input voltage) Rated Current: 10A Maximum Current: 20A Control Power: 6V*10A=60W,12V*10A=120W... 30V*10A = 300 w Potentiometer: Resistance B100K; Line 30 cm long; Hole size 8mm Speed Range: 5-100% PWM Frequency: 21KHz Board Size: Approx. 60 * 50 * 28mm / 2.4 * 2 * 1.1in Package list:  1 * Speed Regulator Notes: 1. The positive and negative of the power supply cannot be reversed, while the positive and negative poles of the motor can. 2. The input must be direct current, not ac. 3. Input dc power or battery, the voltage value is equal to the rated voltage of the motor, 24V 200W, 12V 120W, 6V 60W motor all can be used.