Audfly01
https://www.audflyspeaker.com/characteristics-of-directional-sound-technology.html
Nowadays, everyone pays attention to privacy. Whether it is at home or public space, work or entertainment, headphones have become the first choice for obtaining audio sources. However, wearing headphones for a long time will cause more or less hearing damage to a certain extent; Hearing loss is common among the elderly. In daily life, the elderly often make up for the lack of hearing by increasing the volume of the sound. However, the excessively high volume will not only cause a certain degree of distress to the family members around them, but also invisibly damage the hearing of themselves and their family members to varying degrees.