Mice have a hearing range that extends into the ultrasonic range, from about 1 kHz to 100 kHz, which is much higher than the human range of 20 Hz to 20 kHz. Mice are most sensitive to frequencies between 12 kHz and 24 kHz.
Ultrasonic rodent repellers are not effective pest control for mice because mice and other rodents can quickly become accustomed to repeated sounds. Ultrasonic sound waves may also be blocked by the objects mice hide behind, under, and in。
我家也有幾個，車庫有一個功率大驅鳥的好像有些作用，但是吵人
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