Are mouse repellers harmful to pregnant women?

We know that ultrasonic rodent killers use ultrasound waves that are higher than the rats’ ultrasound waves to stimulate their hearing to achieve the purpose of expelling them, but does ultrasonic rodent killers have any harm to pregnant women?

Ultrasonic rodent killers can stimulate the hearing of rats and drive them away. So, are ultrasonic rodent killers harmful to pregnant women?

In summary, the effective ultrasound for rodents is at least above 30KHz (the frequency of the baby mouse's cry for help), while the limit of human hearing system is below 20KHz. Relatively speaking, the limit of children's hearing system is closer to this value, and it will gradually decline in adults. In other words, if it is a real ultrasonic mouse repeller, neither adults nor children can feel it.

When it comes to the destructive effects of ultrasound on the human body, the focus is on high-energy and high-frequency ultrasound. The energy level of medical B-ultrasound is already considered safe, and the output power of an ultrasonic rodent killer cannot be greater than that of B-ultrasound. (The frequency of B-ultrasound is generally above 20MHz, and the output power is around 300W. Long-term exposure to ultrasound of this frequency and output power may cause certain harm to the fetus, but a single examination is unlikely to cause significant damage.) Therefore, ultrasonic rodent killers are unlikely to cause harm to pregnant women.

Of course, it is widely believed that people can feel uncomfortable when exposed to ultrasonic environment, but there is no direct evidence for this claim. Relevant research tends to focus on high-energy and high-frequency ultrasonic contact (such as B-ultrasound and ultrasonic tooth cleaning), and there is very little research on the physiological effects of low-energy and low-frequency ultrasound.

I cannot say that ultrasonic rodent killers have no impact, because that would be evading responsibility; similarly, I cannot say that ultrasonic rodent killers have a bad impact, because that would be evading responsibility even more. I can only say that based on my high school (and encyclopedia) knowledge of acoustics, I judge that ultrasonic rodent killers have no harmful effect on the human body (even that of children).

It is recommended to pay attention to whether the pregnant woman's reaction is abnormal after installation, and you can also find out whether the pregnant woman feels any special noises after installing the mouse repellent for about a week.

However, in restaurants, we still need to regularly check the sanitation problems in the restaurant kitchen to reduce the frequency of "invasion" by rats.