The Metra 40-EU55 is a powered European FAKRA antenna adapter used when installing an aftermarket radio in select GM, Chrysler, Volkswagen, Audi, and BMW vehicles. It adapts the factory amplified antenna system to work properly with aftermarket head units while retaining strong AM/FM radio reception. Main Features Powered amplified antenna adapter Male Motorola connector to male FAKRA connector Retains factory amplified antenna functionality Designed for aftermarket radio installations Plug-and-play design Helps maintain strong AM/FM reception Single FAKRA connector version For dual FAKRA systems, Metra recommends the 40-EU56 Common Vehicle Compatibility Commonly used for select: Volkswagen Audi BMW GM vehicles Chrysler vehicles Typically fits many 2002-up European-style amplified antenna systems. Vehicle fitment should always be verified before installation