uniquegoods 9V 12V 24V 36V 48V 60VDC 20A PWM DC Motor Speed Controller Stepless Variable Speed Regulator With Metal Shell CCM5S Item size:4.14*1.97*1.3",weight:4.45oz Input supply voltage: 9V-60VDC(max) PWM frequency: 25kHz; Duty Cycle adjustable: 5%-100% Input current:10A,the max.20A. The item with metal shell and connective lable,easy to install and use.