In summary, ultrasonic pest repellers emit high-frequency sounds that manufacturers claim reduce household pest infestation, but laboratory tests have shown that the majority of such devices do not work as advertised, in violation of FTC guidelines.

Do ultrasonic pest scarers work?

The answer in our experience: Sadly, no. There are several reasons for the failure of these devices for pest management purposes. ... These sounds are often in your work environment naturally, so once again there seems to be no conclusive evidence that extra ultrasonic sound would be harmful to pests.

Do ultrasonic pest repellers work 2020?

The consensus from each study was that ultrasonic pest repellers have little to no impact on pest activity. The Federal Trade Commission (FTC) has also found that the claims made by some manufacturers are not backed by scientific evidence.