It is very good, as strange as it may seem, it actually works. It does what it says. We have tested it.

When I had it in the big pocket of my jacket, the mirror just turned without the door opening when I pressed the door button.
When I took it out of the pocket and approached it somehow, it opened fine as it should.
Obviously, the door should not have opened when I pressed the button, so it is unsuitable for protection.
The smaller one is slightly better, but the door still opened. Just a moment ago, it opened on the first try (it seems that it got used to it and recognizes it immediately).
WodahS is right about the corresponding one from Amazon.
I bought it and it is perfect.

I bought it to protect my car key inside the house. This particular product is only for home use due to its size. It does its job perfectly. I tested it next to the door and inside the car, and there was no signal for the car to activate. The car couldn't detect anything. So it works flawlessly!!!! I hope I helped