i think this answers your question: 1. Unplug the door chime 2. Pull the battery from the door chime button 3. Enable "accept new hardware" in settings 4. Check undec & byron in RFXtrx433 hardware settings 5. Put the battery back in de door chime button 6. Press it a couple of times 7. Now go and ...

Is the X10 DS90 with a on/off suitable for outdoor use ? Nope, don't think so, but it isn't low cost even. But it has a connection for a extra wired contact. Place DS90 indoor and extra contact outdoor? I'm looking for a outdoor sensor to monitor when the outside entrence gate is openend or closed.

Is the X10 DS90 with a on/off suitable for outdoor use ?

Thanks Siewert.
Your step by step plan did it for me.