1.This Motor PWM Speed Controller adopts with terminals easy Installation. 4.speed controller size:13x6x3.2cm/5.1 Inch x 2.4 Inch x 1.2 Inch (l*w*h).button switch size:4x1.8cm/1.5 Inch x 0.69Inch (h*w).potentiometer size: 23 x 20mm /0.9Inch x0.77Inch (h*w). knob size:15.5x23.5mm/0.6 Inchx1 Inch(h*w),Inner hole size:6mm. 3.LED Display Design which shows percentage rate of actual speed to maximum speed, so the data is readable through the LED display, you can get a precise data easily,but input voltage should be equal to the rated voltage of the DC motor 6-60V. 2.Input Voltage Range: DC 6V-DC 60V.Power supply:12V 24V 36V 48V.Output Current: 0-30A(Can not input 220V and 110V household electricity). 5.It is equipped with a momentary /stop switch and a speed control potentiometer and knob,you can regulator Stepless Variable through the potentiometer to provide a better and stable performance., Manufacturer: Littimoon