Bug repellent that uses sound waves?

I was looking at those insect/bug repellents that use sound waves at walmart. You plug it in and it suposedly prevents spiders, mice and all kinds of other pests from being in the room. My question is do they really work. I just stories of experience, success or failure. Thanks.Bug repellent that uses sound waves?
Save your moneyBug repellent that uses sound waves?
I have installed Ridex Plus, which is suppost to make electric pulses through your wires and scare off pests in your entire house. It sturs them up for a while, but I still have roaches and spiders. On top of that, I have walmart sound repellants in every room in my house. Still have pests.

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