2 stars for a simple case. Obviously, it is not anti-theft. The following tests were conducted: My car is Keyless and unlocks when you approach the key and press the button, so the first test was done like this. I had the case with the key inside the bag, and the door opened normally. Second test, 10 meters away from the car, I pressed the unlock button above the case, and the car unlocked normally. Third test, the car does not need a key, it has a start-stop button, you just need to have the key with you, with or without the case it was exactly the same thing, which should normally indicate that the key is missing.