The Tip Temp for $400 does it. You need a blue tooth cell phone.
I have never tried it but have read that some cell phones (not iPhone unless you jailbreak) can be configured to autoanswer to handsfree.
If you left the TV on loud enough you could at least know the power was still on. A burner phone might be good enough.
There are cell routers for a few hundred and you could use some of the cheaper wifi alarms.
Also Google DIY RV pet monitor; there are some blogs out there.
In Florida, it can get hot quick.
My Kharma ran over my Dogma.