“Cartilage conduction” earphone first launched to police station Shinagawa-ku, Tokyo | NHK

In order to assist aged people who find themselves laborious of listening to, earphones that use the mechanism of “cartilage conduction” to transmit sound by means of ear cartilage can be launched to the police station in Shinagawa Ward, Tokyo. According to the Metropolitan Police Department, it’s the first time within the nation to introduce it to a police station.

Source