The Genuine BMW Auxiliary Turn Indicator Mirror Left - 63137308535 is a replacement mirror for BMW vehicles. It includes an auxiliary turn indicator, which is a light that flashes on the side of the car to indicate when the driver is turning. This mirror is specifically designed for the left side of the vehicle and is an authentic BMW product. It is made with high-quality materials and is designed to fit seamlessly onto the vehicle. This mirror is an important safety feature that helps improve visibility and signal to other drivers on the road. It is a genuine BMW product and is compatible with various BMW models.