Next time you start to put your car keys away, think of this: There is a security alarm system that you probably already have, requires no installation and is ready-to-use. No fees. No charges. It’s the car alarm that operates from that [usually red] “panic” button on your vehicle’s keyless-entry remote control.

If that car alarm goes off when someone is trying to break into your house, odds are the intruder won’t stick around. After a few seconds all the neighbors will be looking out their windows to see who is out there and it’s sure criminals don’t want that.

You should test before you rely on it. The alarm should activate from almost everywhere around your house. Warn others in the vicinity before you start testing. Oh, and select a time when neighbors are not trying to sleep or watch their favorite TV program.

So, it works. Keep that controller close at hand. Have it near your bed at night. Carry your keys in your hand while walking to your car in a parking lot. The alarm can work the same way there as it does at home.