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The frequency of a human infant's cry is approximately between 2,000 to 4,000 Hz. Sounds falling in this frequency range may be perceived as too sharp and unpleasant. Moreover, high-pitched screams or high-frequency construction noise are even more unacceptable than a baby cry.
Immersion is a lightweight and convenient device, and its use is similar to the action of wearing earphones. high-frequency noise can be isolated in the effective range. For those who wear glasses, you can place the device at the end of the glasses frame, which looks more elegant and less visible.