In the end, plugging the holes is the only answer. Been there, done that. The B-team that built my house left lots of hidden mouse highways that I've only discovered when repairing other things. I did have an ultrasonic thingy that did a pretty good job of keeping the mice out of my garage.. but if you have pets that might not work in the house. Fiddling with the EM fields from your wiring isn't gonna do anything to the mice, other than maybe make them chuckle. back to the original question, I've used Minuteman in the past with fine results, but never for mice. ...tom