Features:100% brand new and high qualityThis product is 40A high power Speed Controller, mainly used for controlling the DC motor SpeedThe built-in cooling fan, make it not easy to fever, ensure high efficient workDigital LED display of 0-100% speed percentageThis motor speed controller support DC motor CW and CCW rotationSpecifications:Input voltage: DC10-55VOutput voltage: linear under loadMaximum current: 60AContinuous current: 40ASpeed control type: flow controlSpeed control: potentiometer (linear)Support motor: DC brush motorCW and CCW rotation: supportSpeed regulation range: 0-100%Connection type: terminalKnob specification: 100K (with switch)Type of connection: barrier terminalWeight: 295gPackage included:1 x Motor Speed ControllerNote:1. The digital display is the motor full speed percentage 0-100, non-motor actual speed1. The input voltage must differentiate "+" ,"-"2. The input voltage should be equal to the rated voltage of the motor within 10-55V