This product works well.
I needed to keep mice out of a winter stored Mustang and a fishing boat. These has a potent smell of peppermint which irritates rodents. After storing the car and boat for three months, I checked them and no rodents were in the car or boat, one was in the engine compartment insulation so I place new packets all around, including the engine compartment insulation, and not one rodent has returned. I use these in conjunction with stick traps at the wheels to  hinder the rodents from climbing the rubber. These work much better than traps alone and smell nicer than moth balls.
Rating: 5 stars