Can the effectiveness of the Scarecrow say anything, because we currently have no uninvited guests more in the false floor. I had it by a broomstick and hourly knocking (is very complex, but was successful!) Sold before the cavity Scarecrow was mounted. The mounting in the loft on the top floor was simple, but the sound of the vibrations was clearly audible throughout the upper floor of our wooden house. The cats did not bother, but the low hum of people has but a little annoyed us. We have solved the problem by having a radio remote control attached. So the Scarecrow can easily be switched on and off without having to crawl into the attic when should stop uninvited visit. Only in this case carried out the practical test Scheuch, and its effect I will add to this review.