ctpres - It's there "audible alarm and running light flash". The system has i/o's that can drive relays/horn. Once the system goes into an active alarm all bets are off on power consumption - it uses all it needs. It sips current only when it is in storage monitoring with nothing going on.
I agree that the hard-wired install is a drag but it the only way that I know to keep the consumption acceptable. Might be a deal breaker.
There is a company in WI that does this with a WiFi system (like a few here have suggested) but it will only run for a week or so on one "normal" camper battery. They stipulate that there needs to be an external power source feeding it. I think they also use a regular cell account rather than an M2M device cloud connection - the monthly connection fee is pretty steep.
Thanks!