I have developed a mouse problem in my garage, due to me storing bird seed there. I keep the seed in a covered stainless steel can, but the mousers still have found ways to get in the seed, as well as my bee keeping gear and supplies. I got this unit to put in my garage to clear them out. I cleaned up any spilled seed, and given a few weeks, the mousies seem to have vacated the premises! I verified this by bringing in my Boxer/Staffordshire Terrier/Pittie mix dog to hunt for any remaining mice, and he gave me the all clear! I am going to leave this unit plugged in and going all winter, and hopefully that will be the end to my mouse problem! Thank you for a great product!