🆕T20 7443 LED Front Turn Signal & DRL Light Bulbs 50W 4000LM CAN-Bus Error Free Dual Color Switchback White & Amber B21-PRO Series | 2 BulbsAPPLICATION The 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. Plug and play, easy installation. This LED bulb only fits