This product is a great addition to your existing fob. It fitted my 2021 Audi A3 key fine. It's a great way of protecting the existing key from damage (they are expensive), makes it look smart. Also if you are getting a slightly battered s/h key it will look new again with this addition. On the negative side it is a little tricky to put on. The key itself is heavy, so when this is added it becomes heavier still. It also does not allow you to remove the physical key easily (you would have to take the case off) and therefore if you use the physical key a lot then it would become very tedious putting the cover constantly on and off. But overall - good. Read more