A driveway alarm? Sure it is a very good idea to have one. You'll easily have an idea if somebody parks a car in your driveway or if somebody's approaching in your property. It's safe and allows you to be always on alert of something. To have this alarm doesn't really mean that you'll be spending much. It's not expensive at all and it's for your own property security also. Don't spend less when it comes to your family's security.