My Ford from the year 2000 has a 5 digit keypad on the door. I can lock my keys in the car, leave it running, lock and unlock it without an extra key. I can grant anybody access by just giving them the code. I hated carrying the stupid bulky keyless entry fob in my pocket, and threw it in a drawer, so my keychain is very small. It still has a chipped key to turn on the ignition system and start the vehicle. It's vehicle locking perfection.