ITEM NAME:12V 24V Max 20A PWM DC Motor Stepless Variable Speed Control Controller Swi P4C6 12V 24V Max 20A PWM DC Motor Stepless Variable Speed Control Controller Swi P4C6 CCM5S DC Motor Speed Regulator controls the speed of a DC motor by adjusting Pulse-Width-Modulated (PWM). Suitable for the DC motor (or DC load) within 20A. Adjustable speed range is from 0%-100%. Item size:5*3.3*9.1cm,weight:4.45oz Input supply voltage: 9V-60VDC(max) colour:silver Material:Aluminum alloy PWM frequency: 25kHz; Duty Cycle adjustable: 5%-100% Potentiometer with adjust speed swtich function,and button swtich function. Potentiometer cable length 0.79inch,Button swtich cable length:0.79inch. The item with metal shell and connective label,very easy to install and use. Operating instruction: Before you attempting to wire the controller, make sure power is off. WARNING:DO NOT REVERSE POSTIVE AND NEGATIVE POWER LOADS.THIS WILL DAMAGE THE CONTROLLER. TO CHANGE MOTOR DIRECTION, INTERCHANGE THE POSITIVE AND NEGATIVE WIRES OF MOTOR. Connect wires refer to the "wiring diagram" Turn on the power. Adjust the potentiometer. Package Including: 1 x CCM5S DC Motor Speed Controller with metal shell Note: Light shooting 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.