The windows know the 'welcome'

The sound of advertising emanating from the tiny device mounted on the subway window is transmitted directly to the user's brain, making it unclear to passengers who are talking to them.

>>> New video advertising technology from glass windows

Train passengers heard the sound of inviting to buy goods without knowing where the source came from.

The advertising device is based on a technology called "Bone Conduction" invented by Sky and German advertising agency BBDO. According to Business Insider, the mechanism of this technology is to transmit vibrations to the brain to bring sound to the inner ear of the subject. As a result, those who are interacting feel like the sound is coming from my head, not outside.

Sky launched a campaign called "Talking Window" to test new technology on the subway doors of a subway. When passengers lean on those glass doors, they will suddenly hear the sound of "soliciting" to download Sky Go application for their phones.

The company said the BBDO technology is not new but has not been widely used. Currently, it is only used in military and on assistive devices for hearing impaired people. The strength of BBDO is not to prevent users from hearing outside sounds while the sound coming from the inner ear is always clear even when in a noisy environment.