In theory, ultrasound can affect the activity and feeding of mice, and has a certain driving effect. But mouse repellents do not have good practical results.
Normal mice can hear sound waves of 18-60 KHZ, while rattus norvegicus and Mus musculus have stronger hearing and can hear ultrasonic waves of 100KHz and 90KHz. According to the book, experimental mice will die after being exposed to 20KHz ultrasonic environment for one minute. However, in practical applications, due to the continuous attenuation of ultrasound in the transmission process, the effective distance is short, coupled with strong directivity, it is easy to be blocked by objects, and the most critical is that the mouse has strong adaptability, and it is used to listening. In combination with the above factors, the mouse repeller does not have a good practical effect.