.The Per.Pic C5204CD with Adapter for control from steering wheel Mercedes is designed to make it easier to control the car's audio system from the steering wheel. This adapter is compatible with Mercedes vehicles equipped with the Mercedes COMAND and Audio 20 systems. It allows for integration of various audio sources, including digital music files, external media devices, iPods, Portable CD players, and more. The adapter connects directly into the steering wheel control plug of the COMAND system, and supports both analog and digital audio. It enables the user to adjust the volume via the steering wheel controls like an OEM product, along with the use of additional steering wheel controls like play/pause, track skipping, and repeat mode.