12V Motor Speed Controller, DROK DC Motor Driver Board for Brush Motor 7V-60V 20A 420W PWM Control 12V 24V 36V 48V Regulator Cooling Fans Dimmer Governor Pulse Width Modulator with Adjust Knob DROK motor speed controller operating voltage range is DC 7-60V, max drive current is 20A, control power advice 12V within 200W, 24V within 300W, 48V within 350W.(for reference, depending on motor) Protection & Easy Installation: the dc motor driver is designed with Aluminum shell prevents it from easily damaged; there are holes in its sides and bottom, making it easier to install Speed Control: the improved version control motor speed from original 1%-100% to stepless speed change Special Features: our motor control board is FR4 double panel, reasonable circuit management and fuse allows Stable performance and small heating LED Indicator: the brush motor controller has red LED power supply indicator which will light on when module is power on