Bought 4 units, one for each floor, as stated for square foot coverage. Have more problems with all bugs and/or mice than ever! Never had mice upstairs but do now. I was counting on these being a great help, especially in the cold weather. More mice enter in cold weather. Very dissapointed in the product. It is not as advertised. I feel taken. Money is tight and I have absolutely no satisfaction from this product. No company should be able to advertise totally untrue statements of the capability of their products. c, sure is true! Unfair in every way! read full review »