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What range of ultrasonic wave frequency can be used to repel rats?

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Ultrasonic waves within the frequency range of 20 to 65 kHz can effectively repel rats, as rodents are sensitive to frequencies in this range . Additionally, the study by Van Wieringen and Glorieux suggests that ultrasonic devices emitting frequencies of 12-14 kHz and 25-25 kHz were perceived as disturbing by some participants, especially the younger population . Furthermore, an optimized method utilizing ultrasonic waves with a main frequency of 200-222 kHz has been shown to significantly enhance the repelling effect on mice . The utility model proposed by Zhang and Meng introduces an electronic rat control device that generates acoustic signals ranging from 20 to 40 kHz specifically designed to repel rats . Therefore, frequencies between 20 to 65 kHz are commonly used to repel rats effectively.

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Patent Electronic rat control device Zhang Tingshu, Meng Qingshun - Show less +1 more 24 Jun 2015 1 Citations	The electronic rat control device utilizes 20-40 kHz acoustic signals specifically designed to repel rats, along with 30-60 kHz signals for repelling both insects and rats simultaneously.
Patent Method for repelling mice by utilizing ultrasonic wave Liu Quansheng, Chen Yi, Su Qianqian, Jiao Qin - Show less +3 more 01 Sep 2017	The ultrasonic wave frequency range for repelling mice is 200-222 kHz, with a bandwidth of 30-40 kHz. This optimized frequency range effectively repels mice according to the research.
Open access•Journal Article•DOI Assessment of short-term exposure to an ultrasonic rodent repellent device. Astrid Van Wieringen, Christ Glorieux - Show less +1 more 31 Oct 2018-Journal of the Acoustical Society of America 14 Citations	The ultrasonic wave frequencies used to repel rats in the study ranged from 12-14 kHz, 25-28 kHz, and 35-41 kHz, as specified by the Kemo device settings.
Open access•Journal Article•DOI Gelombang ultrasonik sebagai alat pengusir tikus menggunakan mikrokontroler atmega 8 Denny Wijanarko, Ika Widiastuti, Andriani Widya - Show less +2 more 01 Apr 2019 1 Citations	Ultrasonic waves in the range of 5-100 kHz, exceeding up to 100 kHz under certain conditions, can be used to repel rats due to their sensitivity within this frequency range.
Open access•DOI Construction of an Ultrasonic Pest Repeller C. I. Onah, C.M. Iloka - Show less +1 more 26 Apr 2019	The ultrasonic pest repeller emits frequencies approximately within 20 to 50 kHz range, effective for repelling rodents like rats due to causing auditory stress, discouraging them from the environment.

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