Yeah i debated posting on this one. I bought 2 sets over 20 years or so & then came the class action about false claims of the product. I ended up getting i think 30 bucks a few years ago. Dont know if they ever really helped. Finally got rid of the last of them. We have 4 cats in the house & 3 of them are bug hunters. One definitely is a mouser. Last mouse we had in the house years ago i was sitting in the kitchen & saw her catch a mouse. I screamed when she ran to bring it in the bedroom. She got spooked dropped it & it ran under a cabinet. We never saw it again.
As for the product like i said, didn’t know if it actually worked, but it was a peace of mind knowing there were no critters in the house
I remember seeing this a while back, which made me chuckle.
Wow that’s pretty funny. They actually inspected it too. He does have it on an extension cord though & from memory i think they are supposed to be plugged directly into a wall outlet. Something about the vibrations or noise from it traveling through the walls along the studs & wiring throughout the house. Maybe that was the false claim 
I’ll just keep my clowder of cats thanks 