I just had it turned on and it's kind of a PITA. When you get out of the car, it will beep when it sensed the key is out of the car, like standing by the door after you close it. Then, after the car beeps, if you get about 10 feet from the car, the lights flash and it beeps again and is locked. The reason I say it's a pain, is because in my attatched garage, 20 feet from the key, it's now always locked and just far enough out of range that the request buttons don't work, so I have to go back to the house and get the key if I need something out of the car... sounds minor, but it's taking some getting used to.