The Genuine BMW Antenna Amplifier Diversity (315 Mhz) - 65209276061 is a device designed to enhance the performance of the antenna in a BMW vehicle. It operates at a frequency of 315 Mhz and is used to amplify the signal received by the antenna, improving the overall reception quality. This product is specifically made for BMW vehicles and is a genuine OEM part. It is reliable and durable, ensuring long-lasting performance.