The radio has a power supply unit, but no power adapter.
Power supply unit: Part that is plugged into the socket and supplies the voltage required by the radio at the output. Although often called an "adapter" in English, it is not commonly used in German.
Power adapter: Adapter that comes between the socket and the power supply, if the power supply is a different country variant and does not fit into a Swiss socket (e.g. if digitec imports devices that were intended for another market).