After about 6 weeks this soil is Rattermaschine in operation and the mice on the terrace, who this always USER as a toilet, have disappeared. The device will still operate with the first set of batteries and still works just fine. But you have a little bit patient, the device stuck in the ground and already running moles, mice ... by Acker - which is not so. Joyous side effect: The ants probably have obviously sought also the length, the lawn and on the terrace beds were always plenty to see in the spring of. If it stays that way - so it looks - it was a very good buy.