While the sound cant be heard by the human ear, nearby tablets and smartphones can detect it.
Adobe is developing similar technologies.
Without a doubt, the most concerning of the companies the CDT mentioned is San Francisco-based SilverPush.
CDT officials wrote:
Cross-rig tracking can also be performed through the use of ultrasonic inaudible sound beacons.
The industry leader of cross-gear tracking using audio beacons is SilverPush.
While technology is evolving day by day, corresponding concerns are also increasing.
As there is no way for someone to detect that they are being tracked.
Even if they do manage to detect, there is no way to opt out.
source: www.techworm.net
