I have a second sensor now and will try to simulate that low battery state.
Your information is helpful - just one more clarification if you can:
So, when battery is low the sensor sends two signals when it gets into “open”?
It sends the code for “sensor open” and in addition “battery low”? That would be OK and good for me.
I think the code send as such is pretty clear - the system seems to be that the low battery code always is the “closed” code - 8.
Regards - MacSass
PS: I don´t see any of those sensors sold with the tamper switch installed anymore …