Put your car keys beside your bed at night. If you hear a noise outsid
your home or someone trying to get in your house, just press the panic
button for your car. The alarm will be set off, and the horn will continue to sound until either you turn it off or the car battery dies.
This tip came from a neighborhood watch coordinator.
Next time you come home for the night and you start to put your keys away, think of this:
It's a security alarm system that you probably already have and requires no installation.