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.
Leaky bone conduction headphones are common. If you mind, adjust the volume appropriately, then put on a memory earplug or plug your ear with your finger to experience the music brought by bone conduction.
True bone-conduction headphones: You’ll hear overtone leaky sound, but not external speakers.
Open ears also ensure the possibility of headphones in dangerous situations. It’s safer to use.
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