This DC motor speed regulator controls the speed of a DC motor. It's great for applications like car wiper motor, exhaust fan, etc. Features: 1. Control the forward or reverse direction and the stop of DC motor by switch. 2. Stable performance, high efficiency and low noise. 3. Industrial design, 60A high current, continuous working current can reach 40A. 4. A speed controller, enables you to control the speed of DC motors smoothly. 5. Can be applied to car wiper motor, exhaust fan, etc. providing nice adjustment of motor speed. Specification: Item Type: Motor Speed Controller Input Voltage: 10-55V Output Voltage: Linear Under Load Maximum Current: 60A Continuous Current: 40A Speed Range: 0% -- 100% Control Frequency: 15KHZ Speed Regulation Mode: Potentiometer (With Switch) Speed Regulation Type: Flow Regulation Forward Reversal: Support (No Lock Switch) Digital Display Positioning: 0-100 (Full Speed Percentage) Support Motor: DC Brush Terminal Type: Screw Terminal Size: Approx. 110mm * 78 * 38mm / 4.3 * 3.1 *1.5in Weight: Approx. 265g / 9.34oz Package list: 1 * Motor Speed Controller Notes: 1. The digital display only shows 0-100, which is the motor's full speed percentage and not the actual speed of the motor. 2. The input voltage shall be equal to the rated voltage of the motor. 3. Input must be postive and negative. 1、Control the forward or reverse direction and the stop of DC motor by switch. 2、Stable performance, high efficiency and low noise. 3、Industrial design, 60A high current, continuous working current can reach 40A. 4、A speed controller, enables you to control the speed of DC motors smoothly. 5、Can be applied to car wiper motor, exhaust fan, etc. providing nice adjustment of motor speed.