A technician came in person because two chat client-based technicians said it could be done. But it cannot.
I understand the critical nature of a security system that loses its power connection. Nevertheless, aside from accidentally bumping the cord, there is nothing I can do about losing power. I don't need this box telling me the power is out, or even worse draining its own battery reserve even faster by making a tone every minute.
I would think it would be simple to make the power loss tone similar to the other sensors. That is, it could be made configurable with its own volume level (including volume off).
-Fred