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 Electronic rodent repellents really work?

Electronic mouse repellents operate under the idea of using high-frequency sounds to drive mice away from food sources and nesting grounds within human homes. However, there is little data that these devices repel insects or are effective in rodent control. ...

How long does pest reject last?

On average, an ultrasonic pest repeller lasts from three to five years. You know that it's working if the LED light on the device is lit. You can buy a six-pack of these devices for less than $30.