In fact, we sift for some time less cats in our garden, but we need to regularly check the operation because either the battery is quickly empty or the AC adapter does not tolerate the outdoor humidity. We have a power connection outdoors (external socket) and therefore closed the unit there to (also made sense for us as we wanted to drive the cats just outside). The power supply is, however, corrode soon and no longer functional. Therefore, we are giving only 2 stars because it makes for use little sense, provide an explanatory power supply that can be used only indoors. While it was also on top of the power supply, it is only suitable for "inside" - this we read sadly only afterwards. But an "outdoor" product as unfit equip, is incomprehensible for us. Too bad about the money.