Check the listing for details. DC 6-30V 20A Max 300W PWM HHO Motor Variable Speed Controller Switch 6V 12V 24V. Condition: New. Listed at 5.68 USD. DC 6-30V 20A Max 200W PWM HHO Motor Variable Speed Controller Switch 6V 12V 24VFeatures: CCM6C Motor Speed Regulator controls the speed of a DC motor by adjusting Pulse-Width-Modulated (PWM) Adjustable speed range is 5%-100% Suitable for the DC motor (or DC load) within 10A, Peak current 20ARecommended motor range: within 24V 200W , 12V 120W , 6V 60W Potentiometer cable length 40cm Can protect when you put wrong wang of Positive Pole And Negative Pole Main technical parameters: Input supply voltage: 6V-30V DC The maximum output power:300W The maximum continuous output current:10A;Peak current is 20A PWM frequency:21kHz Duty cycle adjustable:5%-100% Item size:2.36*2*1.1 inches 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, and adjust the potentiometer. Package Including: 1 x DC Motor Speed Controller