Keyless car theft, also known as "relay theft," is a modern method of stealing cars without needing the physical key. Thieves use electronic devices to capture the signal from a keyless entry car's fob, often from outside the victim's home, and then transfer that signal to another device near the car. This tricks the car into thinking the key is nearby, allowing the thieves to unlock and start the vehicle. This technique can be executed quickly and silently, making it a growing concern for owners of keyless entry vehicles.