Review (5/5): Really Works!
We have a large house surrounded by trees. Would be catching mice in the attic regularly. And then we had an invasion of flying squirrels - cute little critters but they belong outside. We used humane live traps to remove the squirrels as they showed up and released them in a field with a hollow tree 2 miles away. Then added one of those sonic devices meant to drive rodents out. Also tried flashing strobe lights (which helped a little). We even had roofing installers who put on our new roof to do a complete inspection to find/fix possible entry points but the critters still found a way in. Then I found these rodent repellant balls and wow! Put one in each end of the attic and have not seen any activity since! I put inexpensive IP cameras in the attic tied into my home security system to keep an eye on activity so I know that these balls are keeping rodents out. It is a real relief to have finally found something that works. I'll be keeping a supply on hand. One caution -- the smell of these things is no-kidding strong. Use gloves to handle and avoid contact with clothes.