What electronic pest control devices really work?

Question

I have a pest problem in my house with mice and insects. That traps and baits aren't really having that much affect. I have been seeing ads for Riddex and Pest Control Plus. You plug them into the wall and they send signals through your house to repel the pests. I would like to know which ones really work so I can get rid of this nuance. Thank You

Answer 1

I've got 3 of the devices and still get mice.  I think they're useless.