Keep your car away from hi-tech jammer thieves and keyless entry thief. "Remote Locking Jammer "the most common way thieves get access to a car. A device transmitting on the same radio frequency as electronic key fobs is used to jam the signal that locks the car. When owners press the lock button on their key fob, the command is prevented from reaching their vehicle and it remains unlocked. So thief can steal whatever’s inside.