Super solution 1

Initially I was a bit skeptical about whether everything is working, but I must say: Hats off! Unproblematic installation and commissioning, all the kittens were immediately recognized and programmed (still necessarily before checking the installation). Now they all have a "key" for the home and other cats and forest dwellers remain outside. There is a possibility of eliminating beep (what I did immediately) and the soft click when the flap rises, does not interfere with my cats. To make it easier for them, I've folded up for about 2 days, the flap permanently and secured so that they have first used only one hole. Then I closed up and use it without any problems. One should only pay attention when buying, if (like me) flap is equipped with an English power plug. An adapter you get in any store, must be ordered, but this was also achieved thanks to Amazon for a few euros and 2 days of waiting.

Update after nearly 1.5 years of use:

- When other cats beating heavily on the door, it may happen that the closure of the bracket is lifted (previously 2 times, we have an aggressive neighbor cat). This can be resolved relatively easily, you have to hold the flap screw from the inside.
- The same hangover manages to solve the sensor in the canopy of the holder - two small screws can counteract this.
- The closing of course needs half a second (figuratively speaking, have not measured!) Until the door to go back. It is only right and proper, we want the kitten velvet tail in it have ;-). Unfortunately, it means that the (again) neighbor had made it (so far 2 times), just to come in hunt for my cats behind. Well, it's annoying, but I blame the cat, not the door, something you can not even prevent.
- Despite lots of other cats, small dogs and other creatures (we live right on the edge) no unwanted visitors (up to a hangover of course * g *)

The only real downside is the one all have cat flaps: It is not a door that goes in both directions, making it leaky and not insulated. It is still the best door, I know and I've had a few. Right now I'm waiting for the first cat door goes on sale. It is dense and insulated. And will probably cost half my salary - let's see.