T20 7443 7440 LED Front Turn Signal & DRL Light Bulbs 300% High Brightness Dual Color Switchback White & Amber | 2 BulbsAPPLICATION Switchback dual function only works when your original bulbs have both parking DRL and turn signal lights in one bulb. Dual color switchback function: Light up white for parking lights or daytime running lights (DRL lights); Light up amber for turn signal lights. The turn signal flashes "amber off amber off, " instead of "amber white amber white", which makes it easier to see. Non polarity installation, both US standard and CK Socket. MAIN