Brake Light Wiring Harness for 2019-2021 Version only for All Tail Light Turn On [Brake Light Fully Lit ]Brake light Wiring Harness Compatible With for 2019 - 2021 [Main function]Enlarge the scope of the car's brake lights, reduce the risk of car accidents, and also add the aesthetic effect of the car's taillights. Make your car more stylish and safe [Function description]In the daytime without turning on the car's taillights, when you step on the brake pedal, the car's tail running lights and brake lights light up at the same time. When you release the brake pedal, the brake lights and driving lights turn off. Installing this product does not affect the taillight function of the car [SPECIAL NOTE]After installing this product, when you turn on the car taillights, the brightness drop to 30% of the. When you hit the brake pedal, the taillight brightness returns to of the car. This design is convenient to brake at night, the taillights and brake lights work at the same time and instantly increase the brightness, so that the vehicles behind can see your more clearly. [Package Contents]a set of Wiring Harness. Color: As shown Material: ABS Package Contents: 1 set * Wiring Harness Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.