Okay, now that you have stopped laughing, I have to admit that I purchased a Pest OFFense. I was skeptical, but I just had a new baby with medical complications and I did not want my house sprayed with chemicals every 3 months. This was 15 years ago.
To my surprise, the little unit worked on eliminating pests. Apparently, it uses the electrical circuitry in your home to create a bug barrier. I am not exactly sure how, but it works.
Fast-forward ten years. I had just moved into a new house and while unpacking boxes I came across the unit. I looked at it and remembered when I purchased it and how it works. I plugged it in and it still worked.
That was five years ago. I have not needed to call an exterminator since.
It does not work well on carpenter ants. However, we have never had any problems with other types of ants. I have never seen a rat, roach, or spider. The paper work suggests you do not use it if you own rodents, reptiles, or the like for pets. It is safe for dogs, cats, and aquatic animals.