The Genuine BMW Auxiliary Turn Indicator Mirror Left - 63137291217 is a replacement side mirror for BMW vehicles. It is specifically designed to function as a turn signal indicator, providing an additional safety feature for drivers. This mirror is made from high-quality materials to ensure durability and reliability. It is a genuine BMW product, meaning it is manufactured by the brand and meets all of their quality standards. This auxiliary turn indicator mirror is compatible with the left side of the vehicle and can be easily installed as a direct replacement for the original mirror.