SMAKN CCM2NJ DC 12-40V PWM Motor Speed Controller Reversible Control Switch Input supply voltage: 12V-40VDC(max) PWM frequency: 21KHz ; Duty Cycle range:5%-100% Item size: 2.76*1.54*1.22 inches ; Net weight: 2.54 ounces The maximum output power: 120W; Power-On LED indicator Incorporate a 10A fuse, and with the protection function of reverse connect power supply.