I can’t answer your main question, but as far as Operating voltage range goes it is
9V to 15V DC
11mA when idle and 48mA when reading
Sorry, I’m trying to find the switching current on the white wire, I know it’s quite low, just give me some time to track it down…
If you haven’t already, throw on a Diode to the white wire just to protect it and run it to a suitably sized relay coil to operate/ switch a higher current, it adds a bit of bulk to your project but at the end of the day it is a great bit of kit.
xEM wiring Video
EDIT
I know where I saw the switching current mentioned, but frustratingly at the moment I can’t get myself back to it on the interwebs.
FYI it was on the German manufacturers website