I have the little key box under my car. It's more because my door locks are unpredictable, the drivers side works like a charm, but the other three are questionable at best. The back two are the real problem, they don't open from the inside, and the passenger side is just plain stubborn. The pass side will sometimes lock and sometimes not. Mind you I have automatic doors and an alarm system that locks on comand, but the door locks don't seem to be on the same page. I'm not too too worried about it now since it's my first car/truck so I like to take a walk around my car to check it out and make sure it's looking allright, but I see that in the future I won't like to use all that time to check every single door, or put the windows down the people in the back can get out.