Repellio Pest Repeller Sound
To understand why the Repellio Pest Repeller sound behaves this way, it helps to know a little about ultrasonic technology. Human hearing typically ranges from approximately 20 hertz to 20,000 hertz under ideal conditions. Ultrasonic devices are generally designed to operate above this upper limit. Because these frequencies fall outside normal human hearing, the device can remain nearly silent while still generating sound energy.
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