The Voice Alert System 6 is one of the most flexible wireless security alarm systems on the market.  You can place the sensors just about anywhere - indoors or outdoors.  The system will work to alert you to opening or closing doors or windows. You can position it at a door leading into a pool areal or within the actual pool area to let you know that someone (including a very small someone) has entered what might be a dangerous area.

 You can also  easily position on one of the sensors outsite by the driveway to act as an alarm should anyone start snooping around your car.  I know far too many people who have been ready to leave for work in the morning, only to discover that their car was stolen in the night.  It's a lousy way to start off your morning.