Okay, fair enough. I'll go with the Kaku then.
There was a nice Byron set with a battery-powered chime, one with a ac-connector and the know itself also had a light that turned on when it was dark and all that for just 30 euros
In most stores I find the Byron B-series doorbells. Really nice sets, not that expensive and also expandable.
Are there any plans for supporting these doorbells with the rfxcom 433?