Mouseblocker electronic repeler?

I use the electronic repellers sold under the Victor brand and they have worked like charm for many years - in the garage, in my house, even under my house. I was going to store a car with a full interior for a few years and ran an extension chord inside with one of the bigger ones - no damage no smell. This is a lot less work than setting and checking traps or having poisoned rodents die somewhere unreachable. There is an unlimited supply of mice out there waiting to replace every one that you kill. Poisoned rodents can be eaten by a whole host of things that do us no harm and then they get poisoned too.