The Genuine BMW Trim Power-Window Unit (Black) - 51427216783 is a replacement part for BMW vehicles. It is designed to control the power windows in the vehicle, allowing the user to open and close the windows with ease. The unit is made with high-quality materials and is an authentic BMW product. It is black in color and has the part number 51427216783. This trim power-window unit is specifically designed for BMW vehicles and is a reliable and durable replacement part.