Have the Wühlmausschreck for two weeks in operation. I bought it to separate me from a mole. I had no great hope in the run, it was simply an attempt this troublemaker move to undress. Have dug the WMS and set in motion. Initially nothing happened, he dug further. Have WMS every three days changed the location. After about 10 days he dug less and after two weeks, I see no more hills; on my lawn. Now I have 5 days rest and think that he has searched for a new station. I let the MMS but run a few more days to play it safe left to gehen.Habe the device another 2 weeks in operation, after a week the mole was active again and digs now in the vicinity of the device. To buy I advise more.