While at first it was perfect, meaning that even inside the car it wouldn't read the key when it was in the case, after about a month it does nothing. It's like the key isn't in the case. The alarm works from five meters away and the car reads the key when it's inside the case.

We got 2! We've had them for 6 months, one works and the other after a while unlocks and locks! I don't understand why!!!!

After several months, it feels like new. The key, as soon as it goes inside, doesn't transmit the signal, even next to the car.

It worked for the first month. From then on, whether the key is inside or not, the car opens normally... so, useless....

Very good! Indeed, even when the key is inside the case, right next to the door, the car does not unlock!! I believe it is worth it.

Even inside the car when the key is in the case, it cannot be detected. I had tried 2-3 other brands but they don't block the signal. Only this one did the job. It is more expensive but worth it...

It does what it says next to the car, you can even go inside and the door won't open. Now, as for functionality, it is slightly bigger than it seems and the key's insert and remove is a bit difficult and takes some time to figure out the way that will suit you to use it.

It does what it promises. As soon as you put the key inside the case, it completely isolates the signal even if you are inside it.

I have it for a month and I can say that it does exactly what it says. It was purchased to protect a Hyundai key. With the key inside, I stand next to the car and it doesn't open. Also, when placed inside my pouch while the engine is running in the driver's seat, it gives me a notification that it can't detect the key. It has a satisfactory size and seems to be able to fit two keys. It has an internal clip to prevent the key from falling out. The construction is of good quality (materials, seams, etc.). It seems durable and doesn't easily break. When opening the lid with the scratch to remove the key, you press two tabs to open it and be able to take it out. The lining inside is like nylon fabric, which, combined with the exterior of the case, seems to protect the key from any impacts and scratches if placed in bags with other objects. The exterior looks high-quality and elegant. Value for money.

I bought it for the protection of my Toyota key. It does its job perfectly, I tested it right next to the door and inside the car and it doesn't emit any signal. It doesn't recognize that there is a key to activate the car. I had a reservation but everything is fine.
In terms of size, it is satisfactory, it comfortably fits a key without a keychain. It has an internal hook to prevent the key from falling. It also has an external hook to secure it wherever you desire.
It is not too small, due to its materials it has a bit of volume. It is an elegant key protection case that you can easily place in your jacket or bag, but it is difficult to fit in your pants.
I hope I helped you

It does what it promises.
In car keys with keyless entry, when it is placed inside the "bag", it does not emit anything and the car does not unlock.