1.This Motor PWM Speed Controller adopts with screw terminals easy Installation.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).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.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.5.It is equipped with a momentary start/stop switch and a speed control potentiometer and knob,you can regulator Stepless Variable through the potentiometer to provide a better and stable performance.Speed control type:speed control mode: potentiometerSpeed range: 0--100%Control frequency: 15KHZWiring type: fence terminal knobLength: 18CMProduct net income: 120 gramsPanel openings: L x W 92mm x 56mmSpeed Digital: Percentage 0-100Colour:As shownMaterial:ABSSize:95 x 60 x 33.8mmPackage Contents:1 * speed controller1 * momentary start/stop switch1 * potentiometer1 * knobNote:1.Digital display is a percentage of non-motor actual speed2.The input voltage must be positive and negative3.Can not input 220V household electricity4.The input voltage should be equal to the rated voltage of the motor (within 6-60V).Such as motor rated voltage 12 input 12V motor 36V input 36VOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing.The measurement allowed error is +/- 1-3cm.