1.This Motor PWM Speed Controller adopts with screw terminals easy Installation. 2.Input Voltage Range: DC 6V-DC 60V. 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 x w x h).button switch size:4x1.8cm/1.5 Inch x 0.69Inch (h x w).potentiometer size: 23 x 20mm /0.9Inch x0.77Inch (h x w). knob size:15.5x23.5mm/0.6 Inchx1 Inch(h x 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: potentiometer Speed range: 0--100% Control frequency: 15KHZ Wiring type: fence terminal knob Length: 18CM Product net income: 240 grams Panel openings: L x W 92mm x 56mm Speed Digital: Percentage 0-100 Colour:As shown Material:ABS Size:95 x 60 x 33.8mm Package Contents: 2 x speed controller 2 x momentary start/stop switch 2 x potentiometer 2 x knob Note: 1.Digital display is a percentage of non-motor actual speed 2.The input voltage must be positive and negative 3.Can not input 220V household electricity 4.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 36V Only the above package content, other products are not included. Note: Light reflection 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.