The National Insurance Crime Bureau has put out an alert about high-tech thieves using keyless access to break into cars.
The criminals use devices that emit signals to cars which normally have keyless entry, experts said.
Some thieves will case parking lots, looking to see which cars respond to the device. That device is sold online.
"It mimics the signal, and people can get access to your vehicle by using this device. It does not allow them to start the vehicle or steal it or anything like that," explained Frank Scifidi, with the NICB.
No departments in North Texas report any instances of this device or type of device being used to break in to vehicles, although bulletins have gone out to be on the lookout for it.