Wow, That looks like more high tech than I was thinking about. I don't always keep a cell phone with me either. I'm mostly interested in keeping overly curious onlookers away from the car. Maybe just a couple of chirps or something to let them know the car is alarmed so they don't smash a window or anything. I can't see me parking it in many high risk places but just want to keep some people away from the car.
Any other suggestions?
