I live in a small town, where crime really isn't an issue, but I do travel alot where crime is an issue. I wanted peace of mind when traveling that some one cruising hotel/motel parking wasn't able to capture my fob's signal. I tested this out in my driveway on 3 different car makes' fobs. Not any of them was I able to open a car door while holding this box in my other hand. So I consider this a success.