12V-24V DC 8A Adjustable Manual Knob Dimmer is a controller that can adjust brightness, its control mode is knob-operated control, you could adjust the light to the appropriate lighting brightness in accordance with your actual need. With a maximum load of 8 Amps, this LED dimmer can be used with constant voltage 12V to 24V LED devices. It also offers continuous single-channel dimming from 100% full brightness to 20% without flickering. A small footprint makes the LED dimmer ideal for use in display cases and in architectural and cove lighting applications.