This morning the cat flap has arrived. They took care of the dimensions in superb existing, sawed hole of the basement door. Drilled Only 2 holes and already could be installed the new. This lasted incl. Reading in the manual total barely 10 minutes.
"Inherently" the tunnel is quite long, so it will be enough for each door installation (for Windows anyway). For thicker walls, if necessary, an additional extension piece must be purchased.
Programming is child's play. Press 1 second one key and the next cat that sticks his head into the tunnel, the license will be sold for entry. Because our cat was curious, the had also done after only 1 minute. Then a few more exercises with treats and even the door was accepted.
The cat flap has an overall robust impression and looks good. The "click" when releasing the lock does not interfere with our cat apparently.
Very large or thick cat may have problems under certain circumstances with this cat flap because it is not one of the greatest and the tunnel is quite long. For petrol normal cats but it is perfect in my opinion.