Features: Large input voltage range from 12~60VDC,suitable for different power source. The knob switch can adjust the motor speed steplessly. With the metal housing,it is easy to install and use. The speed controller is made of premium material,durable and has long service life. The motor controller can make the motor rotate counterclockwise and clockwise. Specification: Input Voltage:DC 12~60V Output Voltage:Linearity under load Output Current: 80A Speed Adjustment Range:0~100% Control Frequency: 21KHz Speed Adjustment Mode:Knob Digital Display Positioning:0~100% Connection Type:Electric Wire Suitable for:DC Brush Motor Size:150 * 85 * 41mm / 5.91 * 3.35 * 1.61in Installation Size: 163mm/6.42in(2*Dia.6mm/0.24in) Weight: 460g/16.23oz Package List: 1*Speed Controller Package List 1Large input voltage range from 12~60VDC,suitable for different power source. 2The knob switch can adjust the motor speed steplessly. 3With the metal housing,it is easy to install and use. 4The speed controller is made of premium material,durable and has long service life. 5The motor controller can make the motor rotate counterclockwise and clockwise.