Anticipation, I bought so many electronic parts that I can not say with 100% certainty what device is it that this miserable raccoon does not bother my sleep. After the device was set up immediately was the "track the marten", the Sch..e the marten was gone within 15 meters. I then the device after a "settling-in period" again with another site provided and see, even here then was not "track" more !!!! The only drawback of the device is processing. DC When installing the front slipped (pictured here knows how to see!) Back. This puts loosely in it, must be re-bonded in any case and can otherwise water in the housing. Disturbing also the lightning can affect, you have it available in front of the window. On the other hand, it is a proof that something outside kreucht or flees. By the way, ... the neighbor's cat makes since then steer well clear of the land :-) The sound you hear in the rest of also very good, only hard of hearing would not hear this. All in all, an alternative to the marten, which is really annoying! I recommend the device!