I just realized that I had a new
Sensaphone 400 that I've never used.
These are used to monitor conditions in a building (such as a greenhouse), and if the monitored conditions call for an alarm, if first alerts you audibly, then, if you don't acknowledge it, it will call up to four phone numbers of your choice (I had my home land line, my cell phone, and my office programmed in my old one).
My old model 1114 died, and was no longer being manufactured, so I got this one and set it up, but never actually put it into service.