If I close the door with a key in the car it "chirps" at me. That is all it does. It does not honk, it is just a very brief beep. I tested this again to make sure I got this right with two key fobs - one in the car, one on me, and that is what it does. So it does make a noise, but it is not prolonged. The doors lock after a few minutes if I walk away. If I stay with the car the doors don't lock. I think this is so the car won't get stolen.