Replacement of the original electronics in your (RADIOMODELL) with a new digitally controlled Class SB power amplifier featuring 4 speaker outputs and 45 watts of power per channel. Integration of a new FM receiver module operated through the original tuner mechanism for stable FM reception. All radio functions are controlled via the original knobs and switches, with continuous digital correction performed by the RTOS microprocessor. If certain functions are not supported by existing controls on the radio, virtual controls are automatically activated. Automatic detection of connected speaker outputs with intelligent activation or deactivation by the digital amplifier stage. Fully protected against wire short circuits, shorts to ground, and shorts to the battery. Advanced suppression of ignition, alternator, and lighting interference noise. Meets OEM and SAE automotive industry specifications.