Precise Speed Control: Our motor speed controllers control the speed of DC motors by adjusting pulse width modulation (PWM), provide accurate and adjustable speed control for a variety of motors and help you achieve the best speed for your specific purpose..It has an LED display; a potentiometer knob and a front brake-reverse switch. Widely used: The adjustable voltage range is truly smooth and can be adjusted from 10V to 55V.The DC motor driver can brush motor speed and dimming adjustments in the DC circuit.Note: Electric vehicles cannot be used. High Quality Material: The motor speed controller is placed safely in a sturdy aluminum box, durable and protects it from injury.Additionally, the holes on the sides and top of the box help it stay cool and ensure it runs well. Input voltage: DC 10-55V; Output voltage: linearity under load; Input current: 60A; Rated current: 40A; Speed range: 0-100%; Speed type: Regulating current; PWM frequency: 15KHZ; Potentiometer:Linear; Wiring type: Terminal; Colour:As Shown Material:Metal Package Contents: 1pcs x pwm controller Only the above package content, other products are not included. Note: Light reflection 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. Product Notes: Please allow a little manual errors.Due to the lighting of the photos and the difference of monitors, the pictures may not reflect the actual color of the real item. Please confirm acceptance before ordering. About Shipping: Please ensure your shipping informations are correct to avoid delivery issues. All orders are shipped within 3 days after payment. Delivery usually takes 8–12 days, The specific delivery time is depend on circumstances. If you have any questions during your purchase, feel free to contact us. We will respond you within 24 hours.