This magnetic cat flap is the solution!
Received quickly, easily installed (a cutting head is provided with the booklet).
Attention, if the door on which you intend to ask it contains metal elements, you have an adapter, not supplied (same for landing on a window). For us it was, it was a simple wooden door. Just a pbm, Our door moldings, we had put a small wedge to hold it correctly (but that is not the fault of PetSafe!)
Consider also the height of installation, it must be put to the height for your cat (the height of his stomach).
Side operation, fine, chat has quickly adapted. It has a bit afraid of the noise when the door is closed but it will get used! One of the other cats lurking in the garden tried dentrer but banged on the door!
Please note, only the magnet is provided, not the necklace. Prefer an anti-choke collar and if the magnetic mechanism does not engage when your cat tries to pass, slightly release the collar so that the magnet is properly detected by the flap.
You will understand, if you need a simple and effective system to ask, go !!!