From a cheekbone to the cochlea
A bone-conduction device turns an audio signal into tiny mechanical vibrations. Its pads rest against the skin over the cheekbones, and those vibrations travel through the bones and tissues of the head to the cochlea—the spiral-shaped part of the inner ear that detects sound.
Inside the cochlea, motion in its fluid bends microscopic sensory cells. Those cells convert the movement into electrical signals that the brain interprets as sound. The usual route is different: sound waves enter the ear canal and make the eardrum vibrate, with the middle-ear bones passing that movement along. Bone conduction largely skips that outer and middle-ear route, but still depends on a functioning inner ear and auditory nerve.
Sound without sealing the ear
Because the ear canal stays open, a listener can hear audio while remaining more aware of nearby sounds. That can be useful during activities where hearing the surroundings matters, or for people who cannot use conventional earphones comfortably. It does not make the audio private or silent to others: some vibration can also radiate into the air, and the device’s pads can be felt against the head.
The route also changes the listening experience. The device must press firmly enough to transfer vibrations, and the sensation can become uncomfortable at higher levels. Since it does not move air through a sealed earbud, its bass and overall sound character may differ from ordinary headphones. The defining tradeoff is simple: the ear canal remains available, but sound reaches the inner ear through a less familiar mechanical path.
