These anti-flicker adapters (also known as LED decoders or LED warning cancellers) are used when you are experiencing issues with your new LED headlights. This adapter fixes the flickering issues that happen when your vehicle's computer sends an alert that the original bulb in the vehicle has been replaced.
They also fix the issue of your computer recognizing the H11 LED headlights as burnt out bulbs. This happens because the LEDs run on such a low wattage that the vehicle sets off the "Bulb out" indicator. This adapter fixes the warning issue and removes the indicator light.