Assertion: pest | /r/Desires | 38-44 khz
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Source sentences:
text: One of the buyers says that the product’s ultrasonic frequency is just 25 kHz which is too low: “I don’t know whether the electromagnetic device works but the US one is completely useless because it broadcasts a far too low frequency, so low that it can bother dogs and cats without doing so for pests which need 38-44 kHz,” he noted.