Bone conduction is a way of sound transmission, which transforms sound into mechanical vibration of different frequencies, and transmits sound through human skull, bone labyrinth, inner ear lymph, spiral organ, auditory nerve and auditory center.

Compared with the classical way of sound transmission, bone conduction omits many steps of sound transmission. It can achieve clear sound reduction in noisy environment, and the sound will not affect others because of its diffusion in the air. Bone conduction technology is divided into bone conduction speaker technology and bone conduction microphone technology:

(1) bone conduction speaker technology is used for receiving speech, which means listening to sound. The air guide loudspeaker transforms the electrical signal into sound wave (vibration signal) and transmits it to the auditory nerve. The bone conduction loudspeaker is the acoustic wave (vibration signal) which is transformed by electrical signal and directly transmitted to the auditory nerve through the bone. The transmission medium of sound wave (vibration signal) is different.

(2) bone conduction microphone technology is used to deliver speech, which is to collect sound. Air conduction is the transmission of sound waves through the air to the microphone, while bone conduction is directly transmitted through the bone.

The earphones made with these bone conduction technologies are called bone conduction earphones, also known as bone conduction earphones, bone sense earphones, bone sense earphones and bone sense earphones.