What Is Relay Theft?
Relay theft is a high-tech car theft technique that allows criminals to steal vehicles without breaking in or triggering alarms. Thieves use specialized electronic devices, often called relay boxes, to intercept and amplify the radio signal emitted by a keyless fob. These devices can pick up the signal even when the key fob is inside a house, apartment, or workplace.

Once the signal is captured, it is relayed to another device near the car, tricking the vehicle into believing the key fob is present. This allows thieves to unlock the doors and start the engine in seconds—often without leaving any visible signs of forced entry.

How to Protect Your Vehicle
Although relay theft sounds alarming, experts say there are simple and affordable ways to significantly reduce your risk.

1. Tinfoil: A Surprisingly Effective Signal Blocker
One of the most unexpected yet effective solutions is wrapping your key fob in tinfoil. According to security specialists, including former FBI agent Holly Hubert, aluminum foil blocks electromagnetic signals. When the signal from your key fob is blocked, thieves cannot intercept or relay it to your car.