Standard ISO cube. It's just that the Opel has a changed plus key and a permanent plus. So yellow and red. The rest of the ISO cube description can be found easily on the net. It has communication with the display at the very top.
You can even use one speaker, but how do you enter the code without having a display and not seeing what is happening? A dozen years ago I bought a display and made a part of the installation for this and similar receivers, it is still useful today.
The discussion revolves around the factory CD radio from the Vectra C 2004, specifically focusing on the connection details of its ISO cube. Users share insights on the wiring configuration, noting that the Opel variant has a modified plus key and a permanent plus connection. A link to a pinout guide for the Siemens VDO CDR2005 model is provided, although the speaker cube description is not included. It is confirmed that the radio can be tested outside the car with minimal speakers, but entering the code without a display can be challenging. One user successfully operated the radio without a display by intuitively pressing keys to enter the code. Summary generated by the language model.