If you have one of those "remote entry" devices for your car on your keychain, then most likely there have been two questions floating in the back of your head since you first u­sed it:

What the heck does this thing do when I push the buttons? How does it unlock the door from 20 feet away?

How secure is it? Can I open someone else's car with it, or can other people get into my car with theirs?

In this article, you'll learn exactly how one of these little devices lets you get in and out of your vehicle securely -- the hopping codes used in modern remote-entry systems are extremely sophisticated!

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