How to keep mouses outside of your house?

Excellent house mouse protection

When you are living on the country side it is very important to keep the mouses and rats outside of your house. We live on the countryside in Sweden and we have seen a lot of mouses outside. But we like to keep it that way. I'v seen a lot of metods, but this is the best one till now.
Just put an special power plug on every floor in the house, as you can see on the picture.You connect it on your electricity network. It gives a signal you cannot hear, but mouses and rats don not like it. In our house we have only two for about 100 m2. It works perfect!

Of course you still have to put away your food properly anyway....