 And it sort of makes you stop and think about, do you want to put a spare key in your pocket? And, you know, why would you want to? But, yeah, the key becomes an integral part of the system. If it doesn't see the right digital signal out of that key, then the handshake is off. The computer network doesn't recognize that you're trying to start the vehicle you own. And it will, by some means, either disable the starter, the fuel injectors, or both and prevent that vehicle from being stolen.