"The raccoon is quenched by a barely audible to the human sound." ARE YOU KIDDING ME? ARE YOU SERIOUS WHEN YOU SAY THAT !!! You can hear the sound very well!
The installation was easy to understand and also went ahead pretty fast. Just getting used to this, shrill whistle deters not only marten but also larger creatures.
After installation I was this whistling to be glad to get rid of.
If you pass on my car, you can hear it every now and again quiet and shrill whistles, but does not interfere further since nothing is heard in the interior of the car!
There should be Marder Schreck's that you do not hear: that cost more and if then help !!! ????