uniquegoods 12V 24V 36V 48V 40A 2000W PWM DC Motor Speed Controller Adjustable Variable Speed Switch HHO Driver PWM frequency: 200Hz; Duty Cycle adjustable: 5%-100% Input supply voltage: 10V-50VDC Item size:4.25*2.17*1.5 inches (size of the shell); Operation environment temperature:-20-40 Output power: 0.01W-2000Wmax The maximum continuous output current :30A; Peak current is up to 40A.