Yeeco DC 7V-60V 20A PWM Controller Stepless DC Motor Speed Control 12V 24V 36V 48V Variable Voltage Regulator Dimming Dimmer Governing Governor Switch CVT Pulse Width Modulator Potentiometer you can adjust power supply output LED power supply indicator which will light on when power on FR4 double panel,fuse allows stable performance,small heating Aluminum shell design, holes in its sides and bottom, easier to install Power supply reversed protection, Controller will not burn when input positive and negative pole are connected reversedly