I am surprised that some here are so opinionated that this is feature is not even needed. Like sever here have mentioned, GM has had this feature for a long time, and since Ford does not have it, it must be a patent issue IMO. I loved it on my old Caddy, and I always listened to the beep which let me know the car was locked. That little beep gave me confidence the car was locked, and I miss that on my new Aviator. On GM cars, each element of the feature could be turned on or off...including auto locking, a beep response and i think a few more options were available to customize the feature to each driver. Also, one of the options I remember would prevent locking your key fob in the car, but i think that could be manually overridden.