We hear sounds through both our bones (bone-conducted) and our eardrums (air-conducted). The majority of sounds are heard by our eardrums. The eardrum converts the sound waves into vibrations and transmits them to the cochlea (or inner ear). Bone conduction headphones work the same way, by converting sound waves into vibrations that can be transmitted via bone directly to the cochlea. Leaving your ears open and eardrums available to hear your surroundings.