1Speed Control: Through simple operation, the motor speed controller enables linear adjustment on the motor speed. 2Easy Switching: With 3 gear rocker switch, the speed regulator can switch the motor between CW and CCW rotation. 3Stable Working: Built in brushless fan ensures quick cooling, also has stall protection for more stable working. 4Input Voltage: The input voltage must be equal to the rated voltage of the motor within the range of DC1055V. 5Simple Wiring: Equipped with barrier terminal, the easy and flexible connection can be quickly completed. Item Type: DC Motor Speed Controller Model: EW87 Input Voltage: DC10-55V Output Current: 0-40A Continuous Power: 2000W Speed Regulation Type: Current regulation. Speed Regulation Method: Potentiometer (linear). Speed Adjustment Range: 0-100% Control Frequency: 25kHz CW Rotation and CCW Rotation: Yes (3 gear rocker switch). Wiring Type: Barrier terminal. 1 x DC Motor Speed Controller The input must be divided into positive and negative, the input voltage must be equal to the rated voltage of the motor, and 220V household electricity cannot be input.