Features: Speed controller is made with high quality circuit board which ensures a longer service life. This simple and easy-to-use DC motor speed controller has an stable performance. The output current of this motor speed controller can be adjusted from 0A to 30A, and it is simple to set. Designed with a digital display that shows the rate in percent of actual speed to maximum speed. This motor speed controller uses screw terminals for convenient and quick wiring. The positive and negative pole of controller must be connected correctly, otherwise, the item might be burnt. The input voltage of controller is better to be same as rated voltage of motor. Product parameters: Input voltage: DC6-60V Output voltage: linear under load Output current: 0-30A Continuous current: 20A Speed control type: flow adjustment Speed control mode: potentiometer Speed range: 0 - Control frequency: 15KHZ Wiring type: fence terminal block Knob line length: 15CM Module size: 75MM x 56MM x 28MM Note:the digital display is the percentage non-motor actual speed Material: PCB colour: green Package Contents: 2 x DC motor speed controller Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.