The Genuine Mercedes Door Mirror Turn Signal Light - 1648200521 is a replacement part for the turn signal light located on the side mirror of a Mercedes vehicle. This light is specifically designed for the Mercedes 1648200521 model and is an authentic, genuine product from Mercedes. It is made of high-quality materials and is designed to match the original specifications of the vehicle. This turn signal light is essential for indicating turns and lane changes, making it an important safety feature. It is a direct fit for the door mirror and does not require any modifications for installation.