Check the listing for details. PWM DC 9-60V Max 20A Motor Varible Speed Controller CW CCW Reversible Switch. Condition: New. Listed at 7.99 USD. PWM DC 9-60V Max 20A Motor Varible Speed Controller CW CCW Reversible Switch eatures:CCM5SK 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:4.14*1.97*1.3",weight:4.45ozInput supply voltage: 9V-60VDC(max)PWM frequency: 25kHz; Duty Cycle adjustable: 5%-100% Potentiometer with adjust speed swtich function,and button swtich function.Potentiometer cable length 0.79",Button swtich cable length:0.79".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. 1. Connect wires refer to the "wiring diagram" 2. Turn on the power. 3.Adjust the potentiometer. Package Including: 1 x CCM5SK DC Motor Speed Controller