Has anybody used ultrasonic rodent repellants? Are they effective?

I never get problem with mice but I was always told that only one system works on this planet...predators...get nice cat...big male cat cat keep your place clean...so far it works for many people as the best solution... Note: many cats are lazy...I used to have cat that you can run mice in front of him and he didn't care....lol Second solution..."Shake Away granules" based on the same principle...predators...they use predator smell..it is all natural and easy...

i had a couple that were supposed to deter rodents and bugs-i saw no effect whatsoever. it was a gamble,but a waste of money.

I've seen things on various home programs that say they are not effective at all. I also had an aunt that had one for fleas and rodents, her cat would come up from the basement all the time with a mouse! So I'm going to say from all I've seen and heard, they're definitely a waste of money.

I have one. I don't know if it works because we didn't have a problem before we got it and we haven't had a problem since. From what I understand is that you might have to get more than one depending on how big your place is. Lloyd

Oh my goodness, mice can be such a nuisance, eh. I heard about this ultrasonic repellants before but it is not available in my country. I don't know for sure but a friend told me that its bad for human brain too. She only heard it from another friend too.

I tried this before in my house and it actually made the problem worse. There were mice everywhere after we plugged that thing in. We had to resort to rat poison to get rid of them.

I have one and I don't have a rodent problem, but not sure if there's one in this area to begin with. I had a problem with them being in my yard in the last town I lived in so I had it to prevent it-and I never got any. I had rats the size of cats in my backyard-yuck!