The $20 Gadget: How It Disables Key Fobs Signal Jammers Signal jammers are devices that can disrupt, block, or interfere with radio frequencies, including those used by key fobs.

And then he unlocks it. Your key fob emits an RFID signal which unlocks the car. By cloning it, the device makes the car’s anti-theft system think your key fob is next to it. No broken glass, no ...

Thieves amplify a vehicle's radio signal to access and copy the key fob signal to steal a vehicle. Here's how to block the signal.

Auto technology has evolved and many newer cars use wireless key fobs and push-button starters instead of traditional metal keys. But that technology also makes things easier for thieves.