Imagine walking up to your car, opening the door with a simple touch, and starting the engine without ever taking your key out of your pocket. For millions of drivers, this convenience has become part of everyday life thanks to keyless entry and push-button start systems.

Keyless systems use wireless communication between the vehicle and an electronic key fob. When an authorized fob is detected nearby, the vehicle can unlock its doors and permit the engine to start. The biggest advantage is convenience—you don’t need to search through pockets or bags while carrying groceries, managing children, or standing outside in bad weather. Modern systems also incorporate security measures such as encrypted communication and, depending on the vehicle, changing authentication codes. But keyless technology introduces its own concerns, including one method thieves have used to make a vehicle believe its key is nearby when it actually isn’t.