Two ways for the human ear to hear sound:
(1) Air conduction: the sound wave is transmitted to the auricle through the air and through the external auditory canal, causing tympanic membrane vibration
(2) Bone conduction: in addition to air conduction, bone can also transmit sound. The skull vibrates, sending the sound to the inner ear, which can also be heard.
A New Way Of Hearing（Open-Ear Design）
AIR Conduction Technology.Delivers Sound Directionally.Dual listening sports Bluetooth headset
（Not really bone conduction earphones）
Notice : Open Ear Design AIR Conduction Technology–Dual listening speaker
earphones are not really bone conduction earphones. Many other sellers on the platform wrote this type of bone conduction earphone for the purpose of sales.