*Rear-Seat Entertainment System described in this publication is available exclusively as a dealer-installed or port-installed accessory option on the GL-Class, M-Class and R-Class. A different, dual-monitor headrest system is only available as a factory-installed option on some models and is not available for installation by the dealer. For additional information about the factory-installed system, speak with a dealer sales representative or consult the vehicle brochure for your Mercedes-Benz model.