As Katzenschreck it works!

I have a new couch, on which rumtreiben with fondness my two longhairs - stringy, lose hair and do anything they should not. I would of course not so Geren on the couch, but of course that's her favorite place, as soon as I leave the house.
That's why I've been looking for an effective way to make them the couch as unattractive as possible and I came across the Guard Protector.

I must say that was a stroke of genius :) I put the unit on the arm of the couch before I leave the house, and in a way that captures the motion sensor exclusively to the field of coffee. Stage 4, light flash on.
The result is the first day perfect! No more cat hair on the pillow, no pulled threads, the cats are in your basket.

When I come home I make the device then, because I am seemingly blessed with a very good ear, and hear the ultrasonic sound whimpering softly at level 4. But that's ok! It only indicates that I, if I had not even the possibility to deactivate it, would not like to stop me on the couch, because it just sucks!

Gebau right for my purpose! I think it also acts in carports and flower beds, but do not, of course as it is weatherproof. Still perfect for me! Full marks!