To start my Land Rover you use a key. Not a fob. Not an electronic gadget that looks like a Star Trek Tricorder. A key. It doesn’t have a batter so it will never stop working. And I can take it to a locksmith and have a duplicate made. (Yes, a villain can do the same)
But the best part is there is a different key for locking/unlocking the doors on the Land Rover. And once the door is locked, you need the key to unlock it. You can’t reach through the open window and open the door with the inside handle. Nice. I can leave the windows open when it’s hot.