Unfortunately, the science behind ultrasonic pest repellers is ultra-shaky. Seems like an attractive idea though, right? Just plug a charger-sized device emitting undetectable sound into the wall,...
Despite what movies would have you think, rats barely ever make any sounds, at least those that humans are able to hear. Rat’s vocalizations start at around 2 kHz and extend as far up as 100 kHz....
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