Got to second the Wine Gums, they stick to the trap and mice have to give a good tug to get them off. Lying in bed at night listening to "Snap, drumming of little feet getting slower then dead silence" Wait10 minutes the "repeat" etc, etc.Multiple traps and more in areas infested throughout the cold months. I dislike poison but just constantly trap to stay on top of them.
Wine gums and halibut pellets are best baits, just ahead of peanut butter and chocolate spread.
Yes/NoAnyone used those plug ins & knows if they work? ****ers under insulation in loft chewing pipes & joists.