Do ultrasonic pest devices repel mice?

It depends on what kind you get. Invest more and get more in return. Research the reveiws on the product first Ive got one, and its a 2 story house, and it works like a charm.

Theres no more mice in my house, and it got rid of all the insects inside my house too.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.