Features: Large input voltage range from 12~60VDC,suitable for different power source. The knob switch can adjust the motor speed steplessly. With the digital display panel,it is easy to read the parameter. The speed controller is made of premium material,durable and has long service life. The motor is stable and has great performance while using. Specification: Input Voltage:DC 12~60V Output Voltage: Linear Under Load Output Current:80A Continue Current:60A Speed Adjustment Range:0~100% Control Frequency:21KHz Speed Control Mode: Knob Switch Digital Display Positioning:0~100% Connection Type:Electric Wire Suitable For:DC Brush Motor Size:150 * 84 * 41mm / 5.91 * 3.31 * 1.61in Installation Size:163mm / 6.42in Weight:415g/14.64oz Connection Method: NO Color Singnal 1 Red Power + 2 Black Power - 3 Blue Motor + 4 Green Motor - Package List: 1*Speed Controller 1、Large input voltage range from 12~60VDC,suitable for different power source. 2、The knob switch can adjust the motor speed steplessly. 3、With the digital display panel,it is easy to read the parameter. 4、The speed controller is made of premium material,durable and has long service life. 5、The motor is stable and has great performance while using.