uniquegoods 12V 24V 36V 48VDC 20A 500W (Max) Universal DC Motor Speed Controller PWM Adjustable Speed Driver Module without Switch L0577 Item size: 3.04*1.78*1.1 inches ; Net weight: 2.58 ounces Input supply voltage: 10V-60VDC(max) PWM frequency: 25kHz; Duty Cycle adjustable: 5%-100%;Power supply:500W max,Power-On LED indicator Adjustable speed type:adjust current.Adjustable speed mode:potentiometer. Note:The item cannot suitable for brushless fan