According on the packaging the Trixie cat flap is supposed to be quiet. This, however, is by no means. It is rather noisy. Also lubricate the swinging door to the two bearing points left and right has no remedy brought. Since it is quite noisy, it is even more positive for us in hindsight. It is built in the transitional door hallway / cellar and minimal heard from the apartment, but what is good. For if we can check if our "Emma" has just come in or whether it's the neighbor's cat again, which now and then before schleicht.Unsere through the house cat has gathered immediately. Time Short curling from the other side with a little milk, hey presto it was by and uses the door now, as if it had always been there. Installation is einfach.Einfach saw out after the template and secure it with screws. Conclusion: If you want a quiet cat flap (eg for door), should better another kaufen.Keine idea how here the positive reviews regarding "noise" or "quiet" come about. But no matter. For us it is ideal and also still very low.