A unique device that talks to weary commuters as they rest their heads on the glass. The contact activates an audio ad that plays into the sleeper’s ear - to the uninitiated, the message from the advert seems to be a voice talking inside their head, and nobody else can hear it. A small transmitter attached to the window sends out inaudible high-frequency vibrations, which translate into sound in the brain. This magic is known officially as ‘Bone Conduction’, and has previously only been used by the military and to help the deaf.
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