There are three options:
1) Pro Combi remote (PCRC) - this is just a replacement remote with a very small cable hardwired to it. This is the bare minimum for your Combi's operation.
2) Pro Combi remote (PCRCWC) with 10m of extension cable and the adapter connector block for the sake of the extension cable.
3) Just the 10m of extension cable and the adapter / connector block for the sake of extension.