Patent ID: 8521239

Claim:
A mobile telephone comprising a cartilage conduction unit to transmit vibration to ear cartilage through direct contact therewith, the cartilage conduction unit being located at at least one of two corner parts at an upper side of the mobile telephone, wherein when the cartilage conduction unit is brought into contact with at least one part of the ear cartilage around an entrance part to the external auditory meatus without making contact with the auricular helix, the sound pressure inside the external auditory meatus at about 1 cm from the entrance part of the external auditory meatus has an increase of at least 10 dB over that in the non-contact state, and the sound pressure inside the external auditory meatus at about 1 cm from the entrance part of the external auditory meatus changes by at least 5 dB increase due to a change in contact pressure; and, when the entrance part of the external auditory meatus is occluded by an increase in contact pressure, the sound pressure inside the external auditory meatus at about 1 cm from the entrance part of the external auditory meatus has an increase of at least 20 dB over that in the non-contact state.