It's now well known that car thieves can steal your car with a few hundred dollars worth of electronics. To stop them some people are buying Faraday boxes or shielding their keys in tin foil. On most new cars that use the smart key system there is another little known setting you can make to the car yourself to stop these type of thieves dead in their tracks without using anything but the car's own settings - Everyone that has a smart key equipped car should watch this video